Burning coal produces a large amount of energy. This statement is false about coal. Therefore, option D is correct.
What is burning coal ?In the United States, coal is primarily used as a fuel to generate electricity. Bituminous coal, subbituminous coal, or lignite are burned in coal-fired power plants. The heat generated by coal combustion is used to convert water into high-pressure steam, which drives a turbine and generates electricity.
Carbon is found in all living things, including humans. When coal is burned, the carbon in the coal combines with the oxygen in the air to form carbon dioxide. Carbon dioxide (CO2) is a colorless and odorless gas, but it is one of several gases in the atmosphere that can trap the earth's heat.
Thus, option D is correct.
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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
Equation that represents Jada’s take-home earnings in dollars E = 12.20(h)-7.15
The equation that represents the situation is h=6.82 hours
What is equation?An equation is a formula that is express the equality of two expressions. The equation is representing direct proportion is , by the commenting them with in the equal sign .
As per the given question
Pay hour = $12.20 per hour
Bus fare = $7.15
1.Equation:
Assume that
She has work for "h" hours
Total earning = E
So,E = 12.20(h) - 7.15
If,Total earning = E = $90.45
So,E = 12.20(h) - 7.15
90.45 = 12.20(h) - 7.15
h = 6.82 hours
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Calculate the amount of heat needed to melt 99.9 g of solid acetic acid (HCH,CO2) and bring it to a temperature of 85.1 °C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol
Q = 1.161 J/kg of heat is required to melt 99.9 g of solid acetic acid (HCH,CO2). Q = mL(Latent heat is the energy emitted or absorbed by a body while changing it state ). (Latent heat is the energy released or absorbed by a body while changing it state ).
How to fix?Apply the equation Q = mL where:
Energy is Q. (J)
m = Mass (g)
L = Acetic acid's latent heat of fusion 192(J/g) = J/g
Q is equal to 0.099 kg times 11.73 kj/mol.
Q = 1.161J/kg.
What is latent heat, and what varieties are there?Latent heat is the amount of energy that a substance experiencing a change in state, such as ice turning into water or water turning into steam, can absorb or release while maintaining a constant temperature and pressure. Types: The material exists in three states: solid, liquid, and gaseous.
What does "sensible heat" mean?Heat that can actually be felt is considered to be sensible heat. Instead of the phase shifting, energy is what causes the temperature to vary as it moves from one system to another. For instance, it warms the water instead of melting the ice.
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What a mass from phenylaamine s produced from 378g of aspartame?
The molar mass of phenyl alanine is 165 g/mol and the mas of the phenyl alanine is 211.2 g /mol
What is the mass of the phenylamine?We know that the statement in the question has told that from the reaction equation. It is one mole of the aspartame that is required to be able to obtain one mole of the phenylamine.
Now we know that the number of moles of the aspartame that is required can be obtained by the use of;
Number of moles = mass/molar mass
= 378g/294.3 g/mol
= 1.28 moles
Molar mass of phenylalanine = 9(12) + 11(1) + 14 + 2(16)
=108 + 11 + 14 + 32
= 165 g/mol
Hence mass of the phenylamine = 1.28 moles * 165 g/mol
= 211.2g
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One way to measure temperature in some applications is to monitor
the gas pressure in a rigid, closed container. What is the final
temperature (in °C) of such a vessel, calibrated to initially read 1.00
atm at 0.00 °C, if the pressure changes to 1.25 atm?
Answer:
To determine the final temperature (in °C) of a vessel that is calibrated to initially read 1.00 atm at 0.00 °C if the pressure changes to 1.25 atm, we can use the ideal gas law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
Since the volume, number of moles of gas, and the ideal gas constant are all held constant in this problem, we can rearrange the equation to solve for T:
T = (PV)/(nR)
Substituting the given values into the equation, we get:
T = (1.25 atm * V)/(nR)
= (1.25 atm * V)/(1R)
Since the initial pressure and temperature of the vessel are 1.00 atm and 0.00 °C, respectively, we can use the ideal gas law equation to solve for the initial volume of the vessel:
V = (nRT)/P
= (1 * R * 0.00 °C)/(1.00 atm)
= 0
Since the volume of the vessel is 0, the final temperature of the vessel cannot be determined using the ideal gas law equation.
Therefore, it is not possible to determine the final temperature of the vessel in this situation.
how to balance equation
Answer:
Count each type of atom in reactants and products. ...
Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...
Repeat steps 1 and 2 until the equation is balanced.
Explanation:
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When pentane(C5H12) reacts with oxygen, carbon dixoide and water is produced.
If 18.7 grams of pentane is burned, what mass of carbon dioxide is produced?
Pentane, which has the chemical formula C5H12, reacts with oxygen to produce carbon dioxide and water according to the following balanced chemical equation:
2 C5H12 + 25 O2 -> 10 CO2 + 12 H2O
To determine the mass of carbon dioxide produced when 18.7 grams of pentane is burned, we can use the stoichiometry of the chemical reaction. Stoichiometry is the study of the quantities of reactants and products in a chemical reaction, and it allows us to predict the amount of a product that will be produced based on the amount of reactant consumed.
Since the chemical equation is balanced, we know that for every 2 molecules of pentane that react, 10 molecules of carbon dioxide are produced. This means that for every 2 grams of pentane that react, 10 grams of carbon dioxide will be produced.
Since 18.7 grams of pentane is equivalent to 18.7 / 2 = 9.35 moles of pentane, we can use this value to calculate the number of moles of carbon dioxide produced:
9.35 moles of pentane * (10 moles of CO2 / 2 moles of C5H12) = 9.35 * 5 = 46.75 moles of CO2
To convert the number of moles of carbon dioxide to mass, we can use the molar mass of carbon dioxide, which is 44.01 grams per mole:
46.75 moles of CO2 * 44.01 grams/mole = 2068.7 grams of CO2
Therefore, if 18.7 grams of pentane is burned, approximately 2068.7 grams of carbon dioxide is produced.
A liquid has a volume of 4 mL and a mass of 24 g what is the density of the liquid. (Help rn)
A liquid has a volume of 4 mL and a mass of 24 g, 6gm/mol is the density of the liquid.
What is density?Density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. The unit of density that is most frequently used is grams per cubic centimeter, or gm/mol.
One of an object's most significant and practicable physical characteristics is density. Densities are often used to identify pure substances, classify mixtures, and estimate their composition.
To calculate volume of a substance, we use the equation:
Density = Mass/volume
We are given:
Mass of liquid = 24 g
Volume of liquid = 4 ml
Putting values in above equation, we get:
density = 24 gm /4 ml
or, density = 6 gm/mol.
Hence, the density of liquid is 6 g/ml
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rank the following periods of time in order of their duration, from longest to shortest, as seen from a location on mercury: revolution (year), rotation (sidereal day), solar day (synodic day, or noon-to-noon), period of daylight or darkness.
The correct order is: Revolution> Solar day> Rotation> Period of daylight or darkness.
Revolution:
According to the stars, the Earth orbits the sun in 365 days, 6 hours, and 9 minutes, rotating at a speed between 29.29 and 30.29 km/s. Every fourth year, which is known as a leap year, the 6 hours, 9 minutes add up to roughly one extra day. The extra day added is February 29th.
Solar Day:
A solar day lasts roughly 24 hours on Earth. The Earth's orbit is not a perfect circle because it is elliptical. This implies that certain solar days on Earth are somewhat longer than 24 hours and some are slightly shorter.
Rotation:
The Earth has an inclination of 23.45 degrees from the plane of its orbit around the sun, and revolves on its axis in relation to the sun every 24.0 hours mean solar time. The differences brought on by the non-circular orbit of the Earth are averaged out to create mean solar time.
Period of daylight:
At the equator, day and night are always twelve hours long, with the exception of two tiny effects that lengthen day by roughly eight minutes.
Hence the order is Revolution> Solar day> Rotation> Period of daylight or darkness.
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g 5. (12 pts) which of the following methods are best suited for the synthesis of compound a with high yield?
Through tests and theoretical calculations, the cause of the high yield and the process of the accidental oxidation reaction were determined.
What is an example of synthesis chemistry?When two of the substances sodium and chloride combine to create sodium chloride, common table salt, the reaction is 2Na + Cl2 → 2NaCl. A kind of synthesis process in which metallic nanoparticles react with CO2 to produce the equivalent metallic carbonate is illustrated by the aforementioned interaction between calcium oxide and CO2.
What takes place during chemical synthesis?Synthesis is the process of creating chemical compounds through the reaction of simpler constituents. A difficult and complex task that necessitates the ongoing creation of novel reactions, catalysts, and procedures is the building of sophisticated and defined new molecules.
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caffeine is the active ingredient in coffee, tea, and some carbonated beverages. add lone pairs, as needed, to the structure of caffeine.
Cyclohexane (C6H12C6H12), a cyclic chemical utilized in the production of nylon and discovered during the distillation of petroleum, is shown in three dimensions.
What is cyclic structure?Cyclic structure is defined as a substance where at least some of the atoms are linked together to form rings. The number of atoms in a ring can range from three to hundreds. The VSEPR shape of the caffeine molecule is trigonal planar. There is a 120 degree angle between each atom.
Both pyrimidinedione and imidazole rings are heterocyclic rings; pyrimidinedione rings have a 6-member structure and two nitrogen atoms, whilst imidazole rings have a 5-member structure.
Thus, cyclohexane (C6H12C6H12), a cyclic chemical utilized in the production of nylon and discovered during the distillation of petroleum, is shown in three dimensions.
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Question 30 of 43
The balanced equation for the neutralization reaction of aqueous H2SO4 with aqueous KOH is shown.
H2SO4 (aq) +2KOH (aq) → 2H2O+K2SO4 {aq}.
What volume of 0.240M KOH is needed to react completely with 11.4mL of 0.110M H2SO4 ?
The volume of 0.240 M KOH to react completely with 11.4 ml of 0.110 M sulphuric acid is 5.225 ml.
What is molarity?Molarity of a solution is the ratio of the number moles of solutes to the volume of solution in liters. Molarity is most common term used to express the concentration of a solution.
Let the volume and molarity of the titrant be V1 and M1 respectively and the volume of molarity of the analyte be V2 and M2 then,
M1 V1 = M2 V2.
Given volume of H₂SO₄ = 11.4 ml
Molarity = 0.11 M
Molarity of KOH = 0.24 M
volume of KOH = (11.4 ml × 0.11 M) / 0.24 M
= 5.225 ml.
Hence, the volume of KOH needed for the titration with sulphuric acid is 5.2 ml.
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balance the equation below in acidic medium and select the correct answer for the coefficient of the corresponding reactant or product:
The balance the equation below in acidic medium are :
6Fe²⁺ + 2Cr₂O₇²⁻ + 14H⁺ ----> 6Fe³⁺ + 2Cr³⁺ + 7H₂O
1) The equation is given as :
Fe²⁺ + Cr₂O₇²⁻ -----> Fe³⁺ + Cr³⁺
oxidation half : Fe²⁺ ---> Fe³⁺
reduction half : Cr₂O₇²⁻ ---> Cr³⁺
2) first balance the oxidation half :
Fe²⁺ ---> Fe³⁺ + e⁻
this equation is balanced.
3) balanced reduction half :
Cr₂O₇²⁻ ---> 2Cr³⁺
add seven H₂O molecule on the right side to balance the O atoms.
Cr₂O₇²⁻ ---> 2Cr³⁺ + 7 H₂O
to balance 14 H atom add 14 H⁺ on the left side :
Cr₂O₇²⁻ + 14H⁺ ---> 2Cr³⁺ + 7 H₂O
now, balance the charge :
Cr₂O₇²⁻ + 14H⁺ + 6e⁻ ---> 2Cr³⁺ + 7 H₂O
6 electrons are gained by the reduction half , so multiply 6 in oxidation equation
6Fe²⁺ ---> 6Fe³⁺ + 6e⁻
add both the equation we get :
6Fe²⁺ + 2Cr₂O₇²⁻ + 14H⁺ 6e⁻ ----> 6Fe³⁺ + 2Cr³⁺ + 7H₂O + 6e⁻
The final balanced equation is given as :
6Fe²⁺ + 2Cr₂O₇²⁻ + 14H⁺ ----> 6Fe³⁺ + 2Cr³⁺ + 7H₂O
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which of the following is a likely outcome of increased water temperature on ph? group of answer choices when carbon dioxide disolves in water, it forms carbonic acid sea creatures retain oxygen and release acidic urine melting sea ice releases water with a ph of 5 coral reefs break down with heat and release acids into the water
The effect of increasing water temperature on pH is A. When carbon dioxide dissolves in water, it forms carbonic acid.
The degree of acidity of a solution is also known as pH. A solution is said to be neutral if it has a value of 7, is said to be acidic if it has a pH below 7, and is said to be alkaline if it has a pH above 7.
The increase in seawater temperature can be caused by the absorption of carbon dioxide from the atmosphere which can cause the formation of carbonic acid and the release of H+ ions which cause acidity so that the pH will decrease. The released hydrogen ions will bind to carbonate ions to form bicarbonate resulting in a decrease in carbonate ions, this can be harmful to marine biota such as the calcification process in corals which requires carbon ions.
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A sample of seawater has a chloride concentration of 1.94%(m/v).What is the chloride concentration of this seawater in ppm?
The concentration of chloride ion in the sample of seawater in ppm is 1940 ppm.
What is the concentration of a substance in ppm?The concentration of a substance in ppm means concentration in parts per million.
Concentration in parts per million, ppm, is equivalent to a concentration of mg/L.
The concentration of chloride ion in the sample of seawater = 1.94 %
A percentage w/v concentration of 1.94 % = 1.94 g/L of solution.
To convert this concentration in grams per liter to mg per liter, we do the following:
1 g = 1000 mg
Hence, 1.94 g = 1940 mg
Hence, the concentration in parts per million = 1940 mg/L or ppm.
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Consider the following chemical equilibrium: N2(g)+3H2(g) -><- 2NH(g) Now write an equation below that shows how to calculate Kp from Kc for this reaction at an absolute temperature T. You can assume T is comfortably above room temperature. If you include any common physical constants in your equation be sure you use their standard symbols, found in the ALEKS Calculator.
[tex]K_{p} =\frac{K_{c} }{[RT]^{2} }[/tex]
The equilibrium constants for a perfect gaseous mixture are[tex]K_{p} \:and\:K_{c}[/tex]When equilibrium concentrations are stated in atmospheric pressure, the equilibrium constant is [tex]K_{p}[/tex], and when they are expressed in molarity, the equilibrium constant is [tex]K_{c}[/tex]
[tex]N_{2}(g)\rightarrow+3H_{2} (g)\Longleftrightarrow2NH_{3}(g)[/tex]
we need to find the relation between [tex]K_{p} \:and\:K_{c}[/tex] for this balanced equation:
[tex]K_{p} =\frac{[P_{NH_{3} }]^2}{[P_{N_{2} }][P_{H_{2} }]^3}\:\rightarrow(1)[/tex]
where[tex]P_{x}[/tex] means partial pressure of gas [tex]x[/tex].
By ideal gas equation
[tex]PV=NRT\\P=\frac{N}{V} RT[/tex]
And [tex]\frac{N}{V}=\frac{moles}{volume} \\[/tex] denotes concentration
[tex]P=[C]RT \rightarrow[/tex] where C means the (1)
[tex]K_{p} =\frac{[NH_{3}] ^{2}.[RT]^{2} }{[N_{2} ] ^{2}.[RT]^{}\times[H_{2} ]^{3} [RT ]^{3} }[/tex]
[tex]K_{p} =\frac{[NH_{3}] ^{2}. }{[N_{2} ] ^{}.[^{}\[H_{2} ]^{3} } \:[/tex][tex]\times\frac{1}{RT} \rightarrow(2)[/tex]
we know for the reaction equilibrium constant in terms of concentration-
[tex]K_{p} =\frac{[NH_{3}] ^{2}. }{[N_{2} ] ^{}.[^{}\[H_{2} ]^{3} } \:[/tex]
Replacing this in equation no (2),
[tex]K_{p} =\frac{K_{c} }{[RT]^{2} }[/tex]
[tex]K_{p} ={K_{c} }{[RT]^{\triangle n} }\\\triangle n=(moles\:of \:gaseous\: products)-(moles \:of \:gaseous\:reactant)[/tex]
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which of the following should be compared when deciding whether a given nucleophilic acyl substitution reaction will occur as written? select all that apply.
The following should be compared when deciding whether a given nucleophilic acyl substitution reaction will occur as written :
the relative basicity of the nucleophile and leaving group.The nucleophilic acyl substitution reaction will occur as written there are the following that we should compare is given as follows :
we should compare the relative basicity of the nucleophile and the basicity of the leaving group.the abilities of the relative abilities of the leaving group to nucleophile and the leaving group.The nucleophilic acyl substitution is the reaction in which the carbonyl and the nucleophile will forms a new bond of the acyl group.
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Given the approximate pH of the following items, calculate the pOH, the [H+], and the [OH-]: oranges 3.5, rainwater 6.2, milk of magnesia 10.5.
pH plus pOH equals 14. POH equals -log[OH-]. The pOH is a measure of a solution's basicity, whereas the pH is a measure of a solution's acidity.
The pOH equation is what How can pH be used to calculate pOH?The concentration of hydrogen ions in a solution is gauged by its pH value. The concentration of hydroxide ions in a solution is determined by its pOH value. The formula pH + pOH = 14 relates the pH and pOH.
What is the pOH formula?You must know the hydroxide ion concentration in moles per liter to calculate the pOH of a solution. The following expression is used to calculate the pOH: pOH equals -log [OH-].
Calculation:pH of oranges 3.5
pH of rainwater 6.2
pH of milk of magnesia 10.5
pH + pOH = 14
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Please help I have less than 9 minutes
If you have just added an acid (such as buttermilk) to your formula, then you are most likely using __________ as a leavening agent.
A. yeast
B. baking soda
C. baking powder
D. baking ammonia
Even if the recipe calls for an acidic ingredient, you can still use baking powder. This is something I frequently do when I add buttermilk or sour cream to cake batter.
The ideal answer is C.
Which of the following items uses baking ammonia as a leavener most frequently?For instance, baking ammonia is particularly effective as a leavening ingredient for low-moisture products with wide surface surfaces and high baking temperatures (less than 3% moisture in the baked product). Crackers, biscotti, and tiny, dry cookies are examples of effective applications.
What flour is the strongest out of the ones listed below?The strongest form of flour, white bread flour has a high protein content (12–14%) and offers a lot of structure.
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Identify the patterns in the data. Try to explain why those patterns might be occurring.
The pattern here is Non-symmetrical or bimodal.
How can you see patterns in data?
Data patterns are frequently explained in terms of their centre, spread, form, and peculiar characteristics. There are specific descriptive terms for several typical distributions, such as symmetric, bell-shaped, skewed, etc. In exploratory data analysis, this is helpful. Probability is a tool for predicting data trends.How do you define "identifying patterns in data"?
A group of facts that repeatedly occurs in an identifiable fashion is called a pattern. It can be found in the asset's history or the histories of other assets with comparable traits. The analysis of trends frequently includes both price and selling volume.To know more about data patterns, checkout this link:
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Primary alcohols can also dehydrate to alkenes. Unlike secondary and tertiary alcohols, the dehydration reaction occurs under an E2 elimination instead of an El mechanism, due to the instability of the primary carbocation that would be formed. Consider the reaction: CH3CH2CH2CH OH H2SO4 product Draw the expected dehydration product of 1 equiv. of a primary alcohol. Select Draw Rings More Erase C H
The product of this reaction is an alkene, specifically 1-butene: CH3CH=CHCH3.
In this reaction, the primary alcohol (CH3CH2CH2CH2OH) is converted to an alkene (CH3CH2CH=CH2) by the addition of H2SO4 as an acid catalyst. The E2 reaction involves the abstraction of a proton from the carbon adjacent to the alcohol, forming a double bond and releasing a molecule of water in the process.
Define primary alcohols?
Primary alcohols are organic compounds containing an alcohol functional group with a carbon atom that has no alkyl substituents. Primary alcohols usually have the general formula CnH2n+1OH, where n is the number of carbon atoms in the molecule. Examples of primary alcohols include ethanol, methanol, propanol, and butanol.
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Sulfur has 6 valence electrons.
Which element could pair with it
in a 1 atom : 1 sulfur ratio?
Answer:
Any Group 2A element (Be, Mg, Ca, Sr, Ba, Ra)
Explanation:
According to the Octet Rule, Sulfur would want to gain two electrons in its outermost shell to achieve an octet (8 total electrons). The elements that could accomplish this in a one-to-one ratio would be Group 2A on the periodic table (alkaline earth metals).
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, alkaline earth metals are the suitable elements.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water. The elements that could accomplish this in a one-to-one ratio would be alkaline earth metals
Therefore, alkaline earth metals are the suitable elements.
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When heated, KClO3 decomposes into KCl and O2.
2KClO3⟶2KCl+3O2
If this reaction produced 94.7 g KCl, how many grams of O2 were produced?
The mass of the oxygen gas produced If this reaction produced 94.7 g KCl is equal to 61 g.
What is the balanced chemical equation?A balanced chemical equation represents the number of atoms of every type of element that is same on the either side of the reaction. The law of conservation of mass is obeyed by every balanced chemical equation.
The total mass on the reactant side is equal to the total mass on the product side in a balanced chemical equation according to this law.
Given a balanced chemical equation of the decomposition of KClO₃:
[tex]2KClO_3 \longrightarrow 2KCl +3O_2[/tex]
The mass of KCl produced = 94.7 g
The number of moles of KCl = 94.7/74.5 = 1.27 mol
Therefore, 1.27 moles of KClO₃ will be decomposed.
2 moles of KClO₃ produces oxygen gas = 3 mol
Then 1.27 mol of KClO₃ will produce oxygen = (3/2) ×1.27 = 1.91 mol
The mass of oxygen gas produced = 1.91 ×32 = 61 g
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The water-gas shift reaction is important in several chemical processes, such as the
production of H₂ for fuel cells. This reaction can be written as follows:
H₂(g) + CO₂(g) → H₂O(g) + CO(g)
with K = 0.106 at 700 K. If a mixture of gases that initially contains 0.632 M CO2 and 0.570
M H₂ is allowed to equilibrate at 700 K, what is the final concentrations of CO?
To solve this problem, we can use the equilibrium constant expression for the water-gas shift reaction:
K = [CO][H2O] / [CO2][H2]
where [CO], [H2O], [CO2], and [H2] are the equilibrium concentrations of the respective species.
We are given the value of K and the initial concentrations of CO2 and H2. We can use these values to solve for the equilibrium concentration of CO.
First, we need to set up the equilibrium constant expression:
K = [CO][H2O] / [CO2][H2]
We are given that K = 0.106 and [CO2] = 0.632 M. We can substitute these values into the equation:
0.106 = [CO][H2O] / (0.632 M)(0.570 M)
We can then solve for [CO] by multiplying both sides of the equation by (0.632 M)(0.570 M) and rearranging:
[CO] = (0.106)(0.632 M)(0.570 M) / (0.632 M)(0.570 M)
[CO] = 0.106
Thus, the final concentration of CO is 0.106 M.
The two chemicals that were in the 2nd unknown solution where...
Potassium Chloride
Barium Chloride
Calcium Chloride
Lithium Chloride
Sodium Chloride
Copper Chloride
Strontium Chloride
Avoid contact with eyes, skin, and mucous membranes as both copper (II) chloride and barium chloride are extremely poisonous when consumed.
What does utilising cobalt glass for identifying sodium and potassium achieve?The potassium ion (K+) emits light in two different colours. By removing the main colour as the potassium burns, you can see the "underlying" hue by using the cobalt glass.
What warnings apply to cucl2 and LICL?Avoid contact with eyes, skin, and mucous membranes as copper(II) chloride is mildly poisonous. Body tissue is sensitive to lithium chloride. Before throwing the wooden splints in the trash, rinse them to prevent trashcan fires. Put on chemical splash goggles, gloves, and an apron to protect your skin.
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Question 3
In the titration described in the previous problem, EDTA binds calcium ions with 1:1 stoichiometry.
If you begin the titration with a beaker containing 247mL of CaCl2 solution, and observe a color change after adding a total of 36.8 mL of 1.69M EDTA solution, what was the molar concentration of the initial CaCl2 solution?
Please enter your answer as a decimal (not scientific notation), using three significant figures.
To calculate the Molar Concentration, we will find the molar concentration by dividing the moles by liters of water used in the solution. The concentration of the initial CaCl2 solution of Ca2+ in CaCl2 solution is 42 mEq/L.
What is molar concentration?
Molarity is a measure of the concentration of a chemical species, especially a solute, in solution and is expressed as the amount of substance per unit volume of solution.
Therefore, To calculate the Molar Concentration, we will find the molar concentration by dividing the moles by liters of water used in the solution. The concentration of the initial CaCl2 solution of Ca2+ in CaCl2 solution is 42 mEq/L.
equation:-
[tex]1:1 stoichiometry,.36.8 mL of 1.69M EDTA solution[/tex]
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In which of the following sets are the charges given correctly for all the ions? a.Na+, Mg+, Al + b.K+, Sr, 0²- C.Rb-, Ba2-, p 3+ d.N-, 0²-, F³-
14) A sample contains 1.46 g of Cobalt-55. After 2.00 days, 0.219 g remains. What is the half-life?
A) 11.6h-1
B) 22.6h-1
C) 1.35 h-1
D) 17.5h-1
E) 0.540 h
The half-life of the Cobalt-55 is equal to 17.4 hr.
What is the half-life of a radioactive element?The half-life of the radioactive isotope can be described as the time required to decrease its actual amount to half after disintegration. The half-life period of a radioactive material is independent of the original or initial amount of the material.
Given, the original amount of Cobalt-55, N₀ = 1.46 g
The remaining amount of Cobalt-55, N = 0.219 g
The time for which decay occurs, t = 2.00 days = 48 hrs
Consider that k is the rate constant of the decay of Cobalt-55,
[tex]{\displaystyle k = \frac{2.303}{t} log\frac{N_o}{N}[/tex]
[tex]{\displaystyle k = \frac{2.303}{48} log\frac{1.46}{0.219}[/tex]
k = 0.0395 hr⁻¹
The half-life time of Cobalt-55 can be calculated from the below-mentioned formula:
[tex]{\displaystyle t_{1/2} =\frac{0.693}{k}[/tex]
[tex]{\displaystyle t_{1/2} =\frac{0.693}{0.0395}[/tex]
[tex]{\displaystyle t_{1/2} =17.5 \;hr[/tex]
Therefore, the half-life period of the given sample of the Cobalt-55 will be to 17.4 hours.
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For the chemical reaction
3KOH+H3PO4⟶K3PO4+3H2O
how many moles of potassium phosphate (K3PO4) are produced from 6.0 mol of potassium hydroxide (KOH)?
Answer:
2 moles
Explanation:
if 3 moles are used to produce one mole of K3PO4what about six do the maths if 3 is equal to one what about 6answer is twoTin (II) fluoride, SnF2, is found in some toothpastes. Tin (II) fluoride is made by reacting solid tin with hydrogen fluoride according to the following BALANCED equation. Sn (s) + 2 HF (g) → SnF2 (s) + H2(g) How many grams of hydrogen gas will be produced if 3.9 moles of tin react?
The mass of the hydrogen gas produced if 3.9 moles of tin react is equal to 7.9 g.
What is the balanced chemical equation?A balanced chemical equation in which the number of atoms of every type of element is same on the both sides of the reaction. The law of conservation of mass is followed by every balanced chemical equation.
The total mass of the elements on the reactant side is equal to the total mass of elements on the product side in a balanced chemical equation according to this law.
Given a balanced chemical equation of the reaction of the tin and HF:
[tex]Sn (s) + 2 HF (g) \longrightarrow SnF_2 (s) + H_2(g)[/tex]
One mole of tin produces hydrogen gas = 1 mol
Then 3.9 mol of tin produces hydrogen gas = 3.9 mol
The mass of 3.9 mol of hydrogen gas = 3.9 ×2 = 7.8 g
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