Answers
The mass of given KBr is 39.151 g.
What is moles?A mole (also called a mole) is a standard scientific unit used in chemistry to measure large amounts of very small entities such as atoms, molecules, or certain other particles.
A mole represents a very large number of units, 6.02214076 × 10²³. The International General Assembly for Weights and Measures defined the mole as this number in the International System of Units (SI), effective from 20 May 2019. A mole was previously defined as the experimentally determined number of atoms in 12 grams of carbon-12. The number of units per mole is also called Avogadro's number or Avogadro's constant, after the Italian physicist Amedeo Avogadro (1776–1856). Avogadro proposed that the same volume of gas under the same conditions contains the same number of molecules. This hypothesis helped determine atomic and molecular weights and led to the concept of moles.
M = n/V
n = M × V
Where, n = number of moles
V = Volume (705 mL or 0.7 L)
M = Molarity (0.47 moles/L)
n = 0.47 × 0.7
n = 0.329 moles
Now, for the mass of solute:
n = m/Mm
m = n × Mm
Where, m = mass of solute
n = number of moles (0.329 moles)
Mm = molar mass (119.002 g/mol)
m = 0.329 × 119.002
m = 39.151 g
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Related Questions
Pls pls help me
In wildlife photography, it is common for the subject to be placed in the middleground. What techniques do these experts use to put the focus on their subjects in the middleground? How have you used these techniques in your own photography practice?
Answers
The technique that wildlife photography experts use to put the focus on their subjects in the middle ground is called Deep Focus.
How do you use Deep focus when making a film?A narrow aperture is typically used to produce deep focus. Because a camera's aperture regulates how much light enters the lens, obtaining deep focus necessitates a bright picture or a lengthy exposure. A wide-angle lens also sharpens a bigger section of the image.
Deep focus in cinematography maintains a tight focus on all parts of an image, catching crucial actions in both the front and background.
Deep focus is used by directors for situations with significant movement in both the front and background of the frame. This type of staging is known as "deep space" or "deep staging" by directors because it involves the placing of performers, props, and set elements at tremendous depth.
A filmmaker must be able to capture a well-defined image for such a shot to succeed. Such sharpness is possible with a deep-focus photo.
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which of the following is not the correct chemical formula for the compound named? remember: transition elements have variable charges.
Answers
The name of the ionic compound is Copper(II) fluoride and its chemical formula is CuF₂.
Ionic compound
The compound which is formed when electron gets transferred from one atom to another atom is known as ionic compound. Ionic compounds are formed usually when a metal reacts with a non-metal.
The nomenclature for writing the formula of an ionic compound is given as:
1. The name of the positive ion is written first.
2. The name of the negative ion is written next and a suffix is added at the end of the negative ion. The suffix written at the end is '-ide'.
3. In case of transition metals, the oxidation states of the transition metals are written in roman numerals in bracket in-front of the positive ions.
CuF₂ is an ionic compound because the element copper is a metal and the element fluorine is a non-metal. The bond that is formed between a metal and a non-metal is always ionic in nature.
The oxidation state of copper in CuF₂ is, (+2)
Thus, the name of ionic compound is, Copper(II) fluoride and its chemical formula is CuF₂.
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Based on your pH data, calculate the concentration of H3O+ and the degree of ionization of acetic acid in solution 1-3. Solution 1 pH=2.73 Solution 2 pH=2.93 Solution 3 pH=4.79 and hpw do these results compare with expected behavior.
Answers
10-6mol dm-3 of H3O + ions are present in pure water.
What occurs when acid is added to water in terms of the concentrations of H3O+ and OH?Acid reacts with water to release H+ ions, which combine with water to create H3O ions since they cannot live alone. This decreases the concentration of ions (H3O/OH-) per unit volume.
What is the pH of a solution with a concentration of hydronium ions H3O +) of 1.0x10 8 m?pH=−log(1×10−8M)=8. Consequently, the solution's pH value is 8.
How does the pH of a solution change depending on the amount of H3O+ ions present?The pH falls in solution when [H3O+] concentration rises. As a result, the solution's acidity rises.
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PLEASE HELP ME!!!!!
At what point does the mass have the most KINETIC ENERGY?
Answers
Answer: Kinetic energy is highest when the velocity is the highest.
Explanation:
Solution #2 will need to contain 11 g/L of cerium (IV) ammonium nitrate (Ce(NH4)2(NO3). We will need to prepare 50.0 mL of solution 2. How many grams of cerium (IV) ammonium nitrate will we need to measure out?
Answers
The mass (in grams) of (NH₄)₂Ce(NO₃)₆ needed, given that the concentration of the solution is 11 g/L, is 0.55 g
How do I determine the mass of (NH₄)₂Ce(NO₃)₆?The concentration of a solution in grams per liter is defined as follow:
Concentration = mass / volume
Using the above formula, we can calculate the mass of (NH₄)₂Ce(NO₃)₆ needed to prepare the solution. This is illustrated below:
Concentration = 11 g/LVolume = 50 mL = 50 / 1000 = 0.05 LMass =?Concentration = mass / volume
11 = mass / 0.05
Cross multiply
Mass = 11 × 0.05
Mass = 0.55 g
Thus, the mass of (NH₄)₂Ce(NO₃)₆ needed is 0.55 g
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Which measurement of length is the smallest?
O 9 x 10-6 m
O 7 x 10-5 m
07 7 x 10¹ m
O 9 x 10² m
Answers
O 9 x 10-6 m.The "Planck length," so named after Max Planck, is the shortest unit of length.It is equivalent to 1.6 x 10-35 meters, roughly.It is around 10–20 times smaller than a proton due to its extreme smallness.
What is the tiniest meter?One thousand times smaller than just a micrometer is a nanometer (nm).It is equivalent to one billionth of a meter, or 1/1,000,000,000 of a meter.When something is this small, neither your eyes nor a light microscope can see it.
From smallest to largest, which unit?Its metric units for length are millimeters (mm), centimeters (cm), metres (m), and kilometers (km), in that order (km).10 mm make up 1 cm, 100 centimeters make up 1 m, and 1000 m make up 1 km.All nations, with the exception of the United States, Liberia, and Myanmar, utilize metric units of length.
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11) Quique mixed 100. milliliters of 1.0 M BaCl₂(aq) and 200. milliliters of 0.5 M Na2SO4(aq) in a coffee cup calorimeter at 45.0°C. The solutions reactec
BaCl₂(aq) + Na₂SO4(aq)
BaSO4(s) + 2 NaCl(aq)
During the reaction, the temperature of the water in Quique's calorimeter dropped to 15.8°C. What is the heat of this endothermic reaction?
-
A)-366 kJ/mol BaCl₂
B)-198 kl/mol BaCl₂
C) 198 kl/mol BaCl₂
D) 366 kl/mol BaCl₂
Answers
The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.
What is reaction?Reaction is a response, typically sudden, to a particular event, situation, or stimulus. It is a type of behavior that occurs as a result of an external force, such as an event, person, or object. Reactions can be physical, emotional, mental, or a combination of all three. Examples of physical reactions include facial expressions, muscle tension, and changes in heart rate and breathing.
The heat of this endothermic reaction can be calculated using the equation q=mc∆T,
where q is the heat,
m is the total mass of the solution,
c is the specific heat capacity of water, and
∆T is the change in temperature.
In this case, the total mass of the solution is 300 mL and the change in temperature is (45.0°C - 15.8°C) = 29.2°C.
The specific heat capacity of water is 4.18 J/g°C.
Therefore, the heat of the reaction is q = (300 mL)(4.18 J/g°C)(29.2°C) = 366 kJ.
Since the reaction is 1 mole of BaCl₂,
The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.
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Please round answer to two decimal places
The percent composition of Ca in CaCl2 is ____ %
Answers
Consider one mole of CaCl₂ is given. The molar mass of CaCl₂ is 111 g/mol and mass of Ca is 40 g/mol. Thus, percent composition of Ca is 36.03 %.
What is percent composition?Percent composition of an element in a compound is the ratio of its mass in the compound to the total mass of the compound multiplied by 100.
Consider one mole of CaCl₂ is given. Atomic mass of Ca = 40 g/mol
atomic mass of Cl = 35.5 g/mol
2 moles of Cl = 35.5 × 2 = 71 g.
molar mass of CaCl₂ = 71 g + 40 g = 111 g/mol
The percent composition of Ca in one mole of CaCl₂ is:
= 40 g/ 111 g × 100
= 36.03%.
Therefore, the percent composition of Ca in one mole of CaCl₂ is 36.03 %.
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The question that I. Need help with us in the ohoto
Answers
Answer: 13.175
Explanation:
[tex]\text{Molarity}=\frac{\text{moles of solute}}{\text{liters of solution}}[/tex]
To find the moles of solute, we begin by finding the formula mass of NaOH.
The atomic mass of Na is 23 g/mol.The atomic mass of O is 16 g/mol.The atomic mass of H is 1 g/mol.So, the atomic mass of NaOH is 40 g/mol.This means 527 grams of NaOH is equal to [tex]\frac{527}{40}=13.175[/tex] moles.
So, the molarity is [tex]\frac{13.175}{1}=13.175 \text{ M}[/tex]
Suppose you heat a metal object with a mass of 32.4 g to 96.3 °C and transfer it to a calorimeter containing 100.0 g of water at 17.6 °C. The water and metal reach a final temperature of 24.8 °C. Metal in a covered cup with a thermometer and heat indicated as leaving the metal. What is the specific heat of the metal in J g ⋅ ∘ C ?
Answers
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the specific heat of the metal is 42.09J g ∘ C.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Internal energy is the sum of all kinds of energy that the particles of a matter can possess, for example translational energy. Rotational energy.
for metal for water
m×C×(final temperature - initial temperature) = m×C×(final temperature - initial temperature)
Substituting all the given values in the above equation, we get
32.4 g×C×( 24.8 °C- 96.3 °C) = 100.0 g×4.18×(24.8 °C- 17.6 °C)
-71.5×C= 3,009.6
C= 42.09J g ⋅ ∘ C
Therefore, the specific heat of the metal is 42.09J g ∘ C.
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The malonic ester synthesis is a method for preparing carboxylic acids from alkyl halides. For each of the following carboxylic acid products, draw the structure of the alkyl bromide that would be used in its synthesis. 1. Diethyl malonate, NaOC2H5, C2H5OH 2. NaOH, H2O 3. H3O+, heat 1. Diethyl malonate, NaOC2H5, C2H5OH 2. NaOH, H2O 3. H3O+, heat 1. Diethyl malonate, NaOC2H5, C2H5OH 2. NaOH, H2O 3. H3O+, heat
Answers
1. Diethyl malonate, NaOC2H5, C2H5OH 2. NaOH, H2O 3. H3O+, heat :
cyclopentane. 3 bromo pentane.bromo methyl benzeneThe malonic is the method of the synthesis for preparing the carboxylic acid from the alkyl halides. the alkyl halide are also called as the haloalkanes. one or more alkyl hydrogen atom are replaced by the halogen such as : fluorine, chlorine, bromine, iodine from the alkane compound. the halogen substituted alkanes are called as alkyl halide.
Thus, the alkyl halide form the carboxylic acids by the method of the malonic ester synthesis. the image is attached with the structure of the compounds.
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Using Newton’s 2nd Law (F = ma) complete the following table for different types of cars.
Answers
The force needed to accelerate the Toyota Camry is 7,659 N.
The force needed to accelerate the Chevy Suburban is 11,297.6 N.
The force needed to accelerate the School bus is 83,720 N.
The force needed to accelerate the Semi Truck is 193,701.4 N.
What is Newton's second law of motion?Newton's second law of motion states that the force applied to an object is directly proportional to the product of mass and acceleration of the object.
Mathematically, Newton's second law of motion is given as;
F = ma
where;
m is the mass of the objecta is the acceleration of the objectThe given parameters include
mass of the Toyota Camry, m = 1665 kgmass of Chevy Suburban, m = 2,456 kgmass of school bus, m = 18,200 kgmass of semi truck, m = 42,108 kgThe force needed to accelerate each of the cars is calculated as follows;
F ( Toyota Camry ) = ( 1665 kg ) x ( 4.6 m/s² ) = 7,659 N
F ( Chevy Suburban ) = ( 2,456 kg ) x ( 4.6 m/s² ) = 11,297.6 N
F ( school bus ) = ( 18,200 kg ) x ( 4.6 m/s² ) = 83,720 N
F ( Semi Truck ) = ( 42,109 kg ) x ( 4.6 m/s² ) = 193,701.4 N
Thus, the force needed to accelerate each cars is a function of mass and acceleration of each of the cars.
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The complete question is below;
Using Newton’s 2nd Law (F = ma) complete the following table for different types of cars. mass of the Toyota Camry, is 1665 kg, the mass of Chevy Suburban, m = 2,456 kg, the mass of school bus 18,200 kg and the mass of semi truck, m = 42,108 kg
What is ΔH∘rxn for the following chemical reaction? CO(g)+NH3(g)→HCN(g)+H2O(g) You can use the following table of standard heats of formation (ΔH∘f) to calculate the enthalpy of the given reaction.
Answers
45.1KJ is the enthalpy of the given reaction.
The formation reaction of CO,NH3,HCN,H2O are-
C+ 1/2 O2 =CO,ΔH=-110.5KJ1/2 N2 + 3/2 H2 = NH3,ΔH=-45.90KJ1/2 H2 + 1/2 N2 +C = HCN, ΔH=130.5KJH2 + 1/2 O2 = H2O, ΔH= -241.8KJThus to attain the given equilibrium we reverse the equation 1 and 2 the add with 3 and 4. So ΔH of total reaction is 45.1KJ.
What is standard enthalpy of reaction?
The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.
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Calcium chloride can be made by reacting calcium carbonate with hydrochloric acid. CaCO3(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g) An excess of calcium carbonate was added to 50.0 cm³ of 0.500 mol/dm³ hydrochloric acid. The solution was filtered to remove the excess calcium carbonate. (a) How many moles of HC1 were used in this reaction? (b) Deduce the number of moles of carbon dioxide gas made in this reaction. (c) Calculate the mass of carbon dioxide made in this reaction. (d) Calculate the volume, in dm³, of carbon dioxide made in this reaction at room temperature and pressure (r.t.p.). like to confirm B ans D. Is B 0.0125mol? Is D 24dm ³?
Answers
The mass of HCl is:
0.75×36.5/1000 ×25=0.684g.
1 mole of calcium carbonate reacts with 2 moles of HCl.
Hence, the mass of calcium carbonate that will react completely with 0.684 g of HCl is
100/2×36.5 ×0.684=0.937g.
What is mole?
Mole, symbol Mole is a unit of quantity of matter in the International System of Units (SI). Amount of matter is a measure of how much a given elementary unit of matter is contained in an object or sample. A mole is defined to contain exactly 6.02214076 × 1023 base units. Depending on the substance in question, the basic entities can be subatomic particles such as atoms, molecules, ions, ion pairs, or electrons. For example, 10 moles of water (a compound) and 10 moles of mercury (a chemical element) contain the same amount of matter, and mercury contains exactly one atom per molecule of water, The two volumes and masses are different.
The number of base units in one mole is known as Avogadro's number and represents the approximate number of nucleons (protons or neutrons) in one gram of ordinary matter. The previous definition of mole was the number of elemental units equal to 12 grams of carbon-12, the most common isotope of carbon.
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Choose the answer which best describes what type of solid the eiements and compounds below form, inthat order CH3OH BaBr2 diamond
a. ionic, network, molecular metalic b. network, molecular, ionic, metalic c. atomic, molecular, ionic, network d. network, molecular, ionic, metalic
e. atomic, molecular, ionic, network
Answers
The answer which best describes type of solid the elements and compounds below form, in that order Kr , CH₃OH , BaBr₂ , Diamond are : the correct option is e ) atomic , molecular , ionic , network.
The solid Kr is atomic in nature. Kr is represent the atom. The compound CH₃OH is of molecular type. the OH group is attached to the carbon atom with covalent bond. so, CH₃OH is the molecular compound. The compound BaBr₂ is the ionic compound , the bond present in the BaBr₂ is the ionic compound, that is the bond formed by the complete transfer of the electron. The diamond is the example of the network solid.
Thus, the correct option is : atomic , molecular , ionic , network.
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4. 92.0 grams of sulfuric acid (H₂SO₂) are added to 43.2 grams of calcium.
Which reactant is the limiting reagent?
How much product is formed?
How much excess reagent remains?
(9 pts. total / 2 pts. for equation - 4 pts. for stoich - 2 pts. for limiting reagent - 1 pt. for excess
reagent.)
Answers
The sulfuric acid is the limiting reactant and the mass of the product obtained is 127.8 g.
What is the limiting reactants?We know that the term limiting reactant is the reactant that is present in the least amount. We can know this from the equation of the reaction. We know that the equation of the reaction is written as; [tex]Ca(s) + H_{2} SO_{4} (aq) ----- > CaSO_{4}(s) + H_{2} (g)[/tex].
Number of moles of sulfuric acid = 92.0 grams /98 g/mol = 0.94 moles
Number of moles of calcium = 43.2 g/40 g/mol = 1.08 moles
Given that the reaction is 1:1, the limiting reactant is the sulfuric acid.
If 1 mole of sulfuric acid reacts with 1 mole of calcium
0.94 moles of sulfuric acid reacts with 0.94 moles * 1 mole/1mole
= 0.94 moles of calcium sulfate
Mass of the calcium sulfate = 0.94 moles * 136 g/mol
= 127.8 g
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When a diver swims from deep below the water's surface, up toward the surface, what happens to the pressure on their body and thus also in their blood?
The pressure stays the same
The pressure decreases
The pressure increases
Answers
Answer:
Pressure Increases With Depth The weight of the water above a diver exerts pressure on their body. The deeper a diver descends, the more water they have above them, and the more pressure it exerts on their body.
Explanation:
Use the table below to calculate the atomic
mass of element X. Then use the periodic table
to identify the element. Show all your work.
Answers
The element is Oxygen and the atomic mass is 15.99 or we could say
16 amu.
How would you define atomic mass?The weight of one atom in a chemical element is its atomic mass, denoted by the symbol ma. Protons, neutrons, and electrons, three subatomic atomic particles with atomic masses, are involved.
A chemical element's atoms are the basic building blocks of matter. An atom's central nucleus, which is composed of all of them, is surrounded by one or more negatively charged electrons. The positively charged nucleus contains one or more of the relatively heavy protons and neutrons.
15.995 x 99.762/100 = 15.956
16.999 x 0.00038 = 0.00645962
17.999 x 0.002 = 0.035998
The atomic mass of element X = 15.956+0.00645962+0.035998
For a total of approximately 16 or 15.99, we add these.
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Next, match each of these reactions with the statement below, by writing the appropriate letters in the blanks which follow:
1. Solutions of cupric chloride and silver nitrate are mixed. A precipitate forms: silver chloride. Also, the dissolved compound cupric nitrate is formed.
2. Aluminum acetate and sodium phosphate solutions are mixed, and form aluminum phosphate as a precipitate, plus dissolved sodium acetate.
3. Gallium bromide and potassium sulfide solutions are mixed, and a precipitate forms (gallium sulfide). Also, the dissolved compound potassium bromide is also formed.
4. Solutions of sodium chloride and silver sulfate are mixed. Silver chloride forms as a precipitate. Dissolved sodium sulfate also forms.
5. Zinc bromide and ammonium sulfide solutions are mixed. A solution of ammonium bromide forms, and zinc sulfide leaves the solution as a precipitate.
6. Gallium iodide and lead (II) nitrate solutions are mixed. A yellow precipitate, lead (II) iodide, forms, as does dissolved gallium nitrate.
7. Stannic chloride and sodium sulfide solutions are mixed. The ppt. which forms is stannic sulfide, and dissolved sodium chloride remains in the solution.
8. Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate.
Answers
Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate, the reaction is shown below:-
2CuSO4 + 4KI⟶ 2CuI + I2 + 2K2SO4
What is precipitate?
In aqueous solutions, precipitation is the procedure of remodeling a solute from a supersaturated strategy to an insoluble stable. The stable that bureaucracy is referred to as a precipitate.
Therefore, Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate.
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raw the remaining possible stereoisomers for the following cycloalkane. label pairs of enantiomers and diastereomers.
Answers
Among the remaining possible stereoisomers for the following cycloalkane B and C are enantiomers and A and B are diastereomers.
Enantiomers are substances that have the same connections but different three-dimensional structures. One enantiomer cannot be placed on top of another because enantiomers are not identical to one another. The two opposite enantiomers are called mirror images.
Diastereomers, also known as diastereoisomers, are a subclass of stereoisomers in stereochemistry. Stereoisomers that are not identical mirror images are known as diastereomers. Therefore, they occur when two or more stereoisomers of a molecule do not mirror image each other and have distinct configurations at one or more equivalent stereocenters.
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What is the wavelength of a photon that has a frequency of 4.82 x 1014 hz
Answers
The wavelength of a photon is 622nm and it is a red light.
What is Wavelength?The length of a waveform signal that is propagating in space or over a wire is measured by the separation between identical points (adjacent crests) in the adjacent cycles. This length is typically specified in meters (m), centimetres (cm), or millimetres (mm) in wireless systems (mm).
What is Photon?A discrete bundle (or quantum) of electromagnetic (or light) energy is referred to as a photon. Photons move at the speed of light (3 108 m/s) because they have no mass.
What are the calculations?λ = v/f
where, f = frequency = 4.82 × [tex]10^{14} Hz[/tex]
v = speed of light = 3 × [tex]10 ^{8}[/tex] m/s
λ = 3 × [tex]10^{8}[/tex] / 4.82 × [tex]10^{14}[/tex]
λ = 6.22 × [tex]10^{-7}[/tex]
λ = 622 nm.
Hence, the wavelength of a photon is 622nm and it is red light.
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When zinc metal is reacted with nitric acid, ammonium nitrate, zinc nitrate and water are produced. The balanced equation for this reaction is as follows
What masses of zinc and nitric acid are needed to form 100 g of ammonium nitrate?
A. 261.6 g Zn; 630 gHNO3
B. 400 g Zn ; 1000 g HNO3
C. 81.8 g Zn ; 78.8 g HNO3
D. 327 g Zn ; 787.5 g HNO3
Answers
The masses that we need for the reaction are 261.6 g Zn; 630 g [tex]HNO_{3}[/tex]
What is the masses of the zinc and nitric acid are needed?We know that the place to begin when we are talking about a reaction is to be able to put down the equation of the reaction and this would help us so as to find what we are looking for.
In this case, the equation of the reaction can now be written as;
[tex]Zn (s)+ 2HNO_{3} (aq) ---- > Zn(NO_{3} )_{2} (aq) + H_{2} (g)[/tex].
Using the relation;
Number of moles = mass/molar mass
= 261.6 g/65 g/mol
4 moles
Number of moles of nitric acid = 630 g/63 g/mol
= 10 moles
Thus, we can see from the stoichiometry of the reaction that has been shown in the equation here that we need 261.6 g Zn; 630 g [tex]HNO_{3}[/tex] so as to obtain the required 00 g of ammonium nitrate as it is in the question that we have above.
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Match each agent of mechanical weathering to its picture.
Freezing and Thawing
Animal Actions
Plant Growth
Abrasion
Release of Pressure
Answers
Water, ice, acids, salts, plants, animals, and temperature fluctuations are all mechanical weathering agents. Erosion is the process by which the broken pieces of rock and mineral are moved away after a rock has been cracked.
Is mechanical weathering influenced by freezing and thawing?Rocks that have holes or are porous (have holes) experience freeze-thaw weathering (allows water to pass through). In this case, mechanical weathering is evident. Different fissures in the rock allow water to enter (from rain, melting snow, or ice).
What is weathering with pressure release?Weathering that releases pressure. Definition. expansion associated with the release of confining pressure when deeply buried rock is unroofed, leading to the development of fractures near the surface of solid rock. Typically, fractures spread along surfaces parallel to and near the surface.
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What is the concentration of a KOH solution prepared by diluting 25.0 mL of a 6.0 M stock solution to a final volume of 1.00 L?
Answers
The concentration of the KOH= 0.15M.
What is concentration?
The concentration of a substance, such as salt, in a particular volume of tissue or liquid, such as blood. The substance concentrates when there is less water present.
What is stock solution?
A solution that has been diluted to a lower concentration and will be used. The default strategy could be used independently or as a component of a more complex solution. A working solution is the option we ultimately settle on.
M stock V stock = M dilute V dilute
25ml* 6M = M* 1L * 1000ML/1L
25Ml*6M/1000Ml = M
M dilute = 0.15M
Concentration of KOH = 0.15M
Therefore, the concentration of the KOH= 0.15M.
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How many grams of Calcium are in
2.17 x 10^25 atoms in Calcium?
Answers
Answer:
36 grams of Calcium
Explanation:
In order to calculate the gram of calcium, divide the total number of Calcium atoms by Avogadro's number:
(2.17 x 10^25)/(6.02 x 10^23) =
2.17/6.02 * 10^25/10^23 =
2.17/6.02 * 10^25/10^23 =
0.36 * 10^(25-23) =
0.36 * 10^2 =
0.36 * 100 = 36 grams of Calcium
Place the following in order of increasing boiling point. C3H8, He, CH3OH, HOCH2OH, HC1
Answers
The order of increasing boiling points for the compounds is;
[tex]He < C_{3} H_{8} < CH_{3} OH < OHCH_{2} OH < HCl[/tex]
What is the boiling point?We know that the boiling point of the substance would depend on the kind of intermolecular forces that is existing in the substances. We know that the methanol and the glycol both have strong hydrogen bonds that is occurring in the molecule thus they would have a higher boiling point.
On the other hand, the helium, and the propane compounds only have the dispersion forces thus they would not be expected to have a high boiling point in the sequence.
This implies that helium would have the least boiling point since it contains only dispersion forces and has a low relative molecular mass while hydrogen chloride which has strong hydrogen bonds would have the highest boiling point.
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a molecule that functions as the electron donor in a redox reaction ______
Answers
The atom or molecule that contributes electrons—in this case, magnesium is known as the reducing agent because the reduction of another molecule is made possible by the electrons it donates.
What is the electron acceptor in a redox reaction?a molecule that, during a redox reaction, takes or absorbs electrons from another molecule. In a redox reaction, an electron acceptor reduces itself and acts as an oxidizing agent. Oxygen, nitrate, iron (III), manganese (IV), sulfate, carbon dioxide, and other elements are examples of acceptors.
The electron donor is the reducing agent, right?A chemical species that "donates" an electron to an electron recipient is referred to as a reducing agent in chemistry. This chemical species is also referred to as a reductant, reducer, or electron donor (called the oxidizing agent, oxidant, oxidizer, or electron acceptor).
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51.8 ml of 1.41 m perchloric acid is added to 32.8 ml of calcium hydroxide, and the resulting solution is found to be acidic. 16.5 ml of 3.04 m potassium hydroxide is required to reach neutrality. What is the molarity of the original calcium hydroxide solution? M
Answers
Molarity of the original calcium hydroxide solution = (16.5 ml x 3.04 m KOH) / 32.8 ml = 0.95 m
Step 1: Calculate the moles of perchloric acid in the original solution:
Moles of perchloric acid = (1.41 m)(51.8 ml) = 72.3 moles
Step 2: Calculate the moles of calcium hydroxide in the original solution:
Moles of calcium hydroxide = (32.8 ml)(1 M) = 32.8 moles
Step 3: Calculate the moles of potassium hydroxide needed to reach neutrality:
Moles of potassium hydroxide = (16.5 ml)(3.04 M) = 49.76 moles
Step 4: Calculate the moles of calcium hydroxide in the solution after the addition of the potassium hydroxide:
Moles of calcium hydroxide = 32.8 moles + 49.76 moles = 82.56 moles
Step 5: Calculate the molarity of the calcium hydroxide in the original solution:
Molarity of calcium hydroxide = (82.56 moles)/(32.8 ml) = 2.52 M
Molarity is a measure of the concentration of a solute in a solution. It is expressed as the number of moles of solute per liter of solution (mol/L). It is used to calculate the amount of a solute that must be added to a solution to achieve a desired concentration. It is also used to measure the amount of a substance in a given volume of solution. Molarity is a key concept in chemistry, and is important to understand when discussing the behavior of solutions and the reactions they undergo.
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A chemical equation is shown below.
KNO3 → KNO2 + O2
What are the coefficients that should be added to balance this equation? Use complete sentences to explain your answer.
Explain how this chemical reaction demonstrates the conservation of mass.
Answers
This chemical reaction demonstrates the conservation of mass. Balanced chemical equation is 2KNO₃ → 2KNO₂ + O₂
What is Law of Conservation of Mass?
A neutral atom or molecule can become electrically charged atoms by obtaining or losing a free electron, which is the According to the principle of mass conservation, neither chemical processes nor physical changes can create or destroy mass in a closed system. The mass of the products of a chemical reaction must be equal to the mass of the reactants in accordance with the law of conservation of mass.
That is to say, the mass of any one element at the start of a reaction will be equal to that element's mass at the conclusion of the reaction. The overall mass will remain constant over time in any closed system if we take into account all reactants and products in a chemical reaction.
2KNO₃ → 2KNO₂ + O₂
Now the given equation is balanced because there are equal number of atoms of potassium, nitrogen and oxygen are present on both side of equation.
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Calculate the root mean square speed for a sample of neon gas (Ne) at 298K. Your answer should have three significant figures.Use R=8.314 J/(K mol).
Answers
The root mean square (rms) value for Ne gas at 298k is 606.954 m/s.
Root mean square (RMS) speed of a gas is given by,
[tex]V_{rms}[/tex]=[tex]\sqrt{3KbT/m}[/tex]
where Kb = 1.38*10^-23 JK^-1 is the boltzmann constant.
T=Temperature in kelvin
m=mass of one molecule or an atom of the gas (in Kg)
We can also write the above expression as,
[tex]V_{rms}[/tex]=[tex]\sqrt{3RT/Mm}[/tex] where, Mm/m=R/Kb
where, R=8.314 JK^-1 Mol^-1 is the universal gas constant.
Mm= molar mass of the gas in Kg
for the neon(Ne) gas, Mm=20.2g/mol=20.2*10^-3 kg/mol
T=298k
putting all the values in the above equation, we get
[tex]V_{rms}[/tex]=[tex]\sqrt{3(8.314 Jmol^-1 K^-1)*298K/20.2*10^-3Kmol^-1}[/tex]
=[tex]\sqrt{367.956*10^3 m^2s^-2}[/tex] ( Since, 1J=1kg m^2/s^2)
=606.954 m/s
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