The Avogadro' s number is 6.022×10²³
What is body centered cubic lattice?
The Bravis lattice of the same name serves as the basis for the BCC crystal structure, which has one atom per lattice point at each of the cube's four corners and in its centre. BCC's high proportion of nearest and next-nearest neighbours contributes to its tight proximity and excellent stability.
atomic mass of Ba = 137.327u
No. of atoms of Ba in a BCC unit cell = 2
Edge length of unit cell= 502pm =502ₓ10⁻¹⁰ cm
density =3.50g/cm³
ρ=ZM/N₀ₓV
3.50=2ₓ137.327/N₀ₓ(502ₓ10⁻¹⁰)³
=78.47257/1.265ₓ10⁻²²
N₀=6.02ₓ10²³
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F2 + 2NaCl --> 2NaF + Cl2 (g)
7.6 g of F2 completely reacts with 23.2 g NaCl to produce 14.0 g of Cl2 (g). What mass in grams of NaF is produced?
The mass of NaF that will be produced when 7.6 g of [tex]F_2[/tex] completely reacts with 23.2 g NaCl to produce 14.0 g of [tex]Cl_2[/tex] gas would be 16.80 grams.
Stoichiometric problemFrom the balanced equation of the reaction between [tex]F_2[/tex] and NaCl below:
[tex]F_2 + 2NaCl -- > 2NaF + Cl_2 (g)[/tex]
The mole ratio of the 2 reactants is 1:2. We need to find the limiting reactant.
Recall that: mole = mass/molar mass
Molar mass of [tex]F_2[/tex] = 38 g/mol
Molar mass of NaCl = 58.44 g/mol
Mole of 7.6 g [tex]F_2[/tex] = 7.6/38 = 0.2 mol
Mole of 23.2 g NaCl = 23.2/58.44 = 0.40 mol
From the calculated moles, there is no excess reactant.
The mole ratio of NaCl to NaF is 1:1. Hence, the equivalent mole of NaF produced will also be 0.40 mol.
The molar mass of NaF is 41.99 g/mol.
Mass of 0.40 g NaF = 0.40 x 41.99
= 16.80 grams
In other words, the amount of NaF that will be produced when 7.6 g of [tex]F_2[/tex] completely reacts with 23.2 g NaCl to produce 14.0 g of [tex]Cl_2[/tex] gas would be 16.80 grams.
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Calculate the frequency of light emitted when an electron in a hydrogen atom makes each of the following transitions.
a) n = 4 →→ n = 3
b) n = 5 →→ n = 1
c) n = 5 →→ n = 4
d) n = 6 →→ n = 5
Consequently, v=hE=6. 61010 is the frequency of the light emitted.
How can you figure out the wavelength of light that a hydrogen atom emits during a transition?The Rydberg Formula The Rydberg's Formula, 1=RZ2(1n2i1n2f), determines the wavelength of a photon absorbed by an electron transition. 1 = R Z 2 (1 n I 2 1 n f 2), where is the photon's wavelength, ni is the energy level's starting principal quantum number, and nf is the last principal quantum.
What is the light frequency formula?fλ = c
The equation f = c, where c is the speed of light, connects frequency (f) with wavelength (). Since the speed of light is constant, this equation must be maintained whether the frequency is increased or decreased because the wavelength must decrease.
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What is the volume of a bar of soap that has a density of 2.5 g/cm3 and a mass of 100 g?
O4 cm3
O 0.4 cm3
O 400 cm3
O 40 cm3
The volume of a bar of soap that has a density of 2.5 g/cm3 and a mass of 100 g is 40 cm ³. Therefore, option D is correct.
What is density ?The mass of a substance per unit of volume is its density. A mechanically accepted measure is density. Density is most frequently represented by the symbol, however the Latin letter D may also be used.
The mass of a solid substance's unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.
Density = m / V
volume = mass / density
= 100 / 2.5
= 40 cm³
Thus, option D is correct.
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Substance D has the following properties:
ΔHvap = 34.6 kJ/mol
ΔHfus = 6.3 kJ/mol
Tb = 87.9 °C
Tm = -30.9 °C
Specific Heat (solid) = 4.9 J/g·°C
Specific Heat (liquid) = 2.4 J/g·°C
Specific Heat (gas) = 1.5 J/g·°C
Calculate the energy that must be removed to convert 221.6 g of substance D from a gas at 120.9 °C to a solid at -61.9°C. The molar mass of Substance D is 75 g/mol. Enter your response to the nearest kJ
The total heat that is required to produce the solid is obtained as 34.8 kJ.
What is the energy required?We know that the energy of the substance can be defined as the ability to do work. In this case, energy has been supplied to the system as the heat that is supplied to the substances.
There are stages that the objects would have to go through and in all these stages we have heat that is evolved or absorbed.
As the object cools from 120.9 °C to 87.9 °C
H = mcdT
m = mass of the object
c = specific heat capacity
dT = temperature change
H = 221.6 g * 1.5 J/g·°C * (87.9 °C - 120.9 °C)
H = -10,969 J or 10.969 kJ
As it is converted from gas to liquid;
H = 221.6 g/75 g/mol * 34.6 kJ/mol
H = 2.95 mol * 34.6 kJ/mol
H = 102.1 kJ
As the liquid cools from 87.9 °C to -30.9 °C
H = 221.6 g * 2.4 J/g·°C * ( -30.9 °C - 87.9 °C)
H = -63.2 kJ
As the liquid changes to solid;
H = 221.6 g/75 g/mol * 6.3 kJ/mol
H = 2.95 mol * 6.3 kJ/mol
H = 18.6 kJ
As the solid cools further to -61.9°C
H = 221.6 g * 4.9 J/g·°C * (-61.9°C - (-30.9 °C))
H = -33.7 kJ
Total heat involved;
10.969 kJ + 102.1 kJ - 63.2 kJ + 18.6 kJ - 33.7 kJ
= 34.8 kJ
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how many grams of ethanol, ch3ch2ohch3ch2oh , should you dissolve in water to make 1.30 ll of vodka (which is an aqueous solution that is 6.86 mm ethanol)?
It takes 410.228 g of ethanol to dissolve in water to get 1.30l of vodka.
What disintegrates in water?Soluble refers to things that dissolve in water. Examples of soluble materials are salt and sugar. The term "insoluble" refers to substances that do not dissolve in water. Examples of insoluble substances are wheat and sand.
An organic substance is ethanol. It is an alcohol with the molecular structure C2H6O. You may alternatively write its formula as C2H5OH or CH3CH2OH. A volatile, flammable, colorless liquid known as ethanol has a distinctive flavor and smell that is similar to wine.
When making 1.30 liters of vodha, how many grams of ethanol should be dissolved in water.
Formula of ethanol is C2H5OH.
2(C) = 2(12) = 24
5(H) = 5(1) = 5
1(O) =1(16) = 16
1(H) =1(1)= 1
adding them all to get molar mass
The molar mass of ethanol is 46g/mol
The concentration is expressed in molarity or moles solute per liters solution.
The molar mass of ethanol is 46 g/mol.
To obtain a 1.3 L of vodka,
the following stoichiometric calculation is done:
6.86 mol/L * 1.3 L * (46g/mol) = 410.228 g of ethanol is needed
410.228 g of ethanol is needed to be dissolved in water.
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liquid water at 50 °c is heated to steam at 150 °c. which piece of information is not required to determine the amount of heat that must be added for this change to occur?
ΔH(fusion) is not required to determine the amount of heat that must be added for this change to occur.
What is specific heat and enthalpy of phase transition?
The energy required in the form of heat to increase temperature by one-degree Celsius and enthalpy of phase transition defined as heat change at constant pressure and temperature for per mole substance from one phase to another.
In between 50 to 100 °C water remains in same phase it gains heat so calculate it using specific heat of liquid.
b) At 100°C it absorbs heat and transfer into vapor phase and require ΔH(vaporization).
c) In between 100°C to 150°C in vapor phase specific heat of gas is required.
But no requirement of ΔH (fusion).
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if 93.75% of a radioactive isotope of technetium-99 remains after 24 hours, what is the half-life?
93.75 % of the Tc sample is remaining after 24 hours. The half life of the Tc is thus, 266 hours or 11 days.
What is half life?Half life of a radioactive material is the time taken to decay its half amount. The decay constant k is related to the half life by the expression:
k = 0.693/ t1/2.
Radioactive decay is a first order reaction. Let N0 be the initial amount and Nt be the final amount and t be the time for decay, then,
k = 1/t ln (N0/Nt)
Given Nt = 93.75 %
N0 = 100%.
t = 24 hr.
K = ln (93.75 / 24 hr)/ 24 hr.
= 0.0026 hr⁻¹.
Now the half life t1/2 = 0.693 / 0.0026 hr⁻¹
= 266 hr = 11 days.
Therefore, the half life of the technetium sample is 11 days.
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Whenever Ayan returns from school he empties his water bottle in the potted plant instead
of throwing it in the sink. He always says his housemaid to use the water for watering plants
in the garden after mopping the house.
(a) Can you suggest any other use of the water left after mopping?
(b) What is the function of water in plants?
(c) What values of Ayan is shown here?
Drip irrigation is the ideal irrigation system for use with vegetable gardens, flowers, trees, and other watering needs. A drip irrigation system for gardens helps you save time, money, and water.
What potted plant instead of throwing it in the sink?In those pots lacking drainage holes, a layer of stones is used as a form of drainage layer. By using this method, surplus water might go from the soil and, consequently, the roots of your plant, into the area with the pebbles.
A drip system that has been set up correctly will operate automatically at a certain time of day for a specific duration.
Therefore, a) use the water to wash the car. b) Often used for transpiration to create a suction force, creating a transpiration pull. c) Ayan values water, conserving it and giving the most efficient and optimum function.
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Thermometers in the past were filled with mercury but most are now filled with alcohol instead due to safety reasons. Why do you think alcohol is used instead of water?.
There are some thermometers that use alcohol instead of the mercury that is typically used. Alcohol has a lower freezing point (-114°C) than water (0°C), which is why we use it instead of water.
On the glass capillary tube, alcohol's vivid colour makes it simple to see.
Alcohol thermometer contents are less harmful and will evaporate more quickly than mercury in glass thermometer contents. The most popular variant is made of ethanol since it is inexpensive and has only a minimal risk of spillage.
What is thermometer?
A thermometer is a device used to gauge temperature. It can gauge the temperature of a solid substance like food, a liquid substance like water, or a gas substance like air. Celsius, Fahrenheit, and kelvin are the three most widely used units for measuring temperature.
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Rank the following atoms and ions from least to greatest ionization energy:
Ca2+ Ar Cl- S2-
Chlorine has the highest first ionization energy.
The ionization power is a degree of the capability of detail to enter into chemical reactions requiring ion formation or donation of electrons. it is also typically associated with the character of the chemical bonding inside the compounds fashioned by using the factors. See additionally binding power; electron affinity.
In physics and chemistry, ionization electricity, ionization power is the minimum strength required to remove the most loosely certain electron of an isolated gaseous atom, wonderful ion, or molecule.
On the periodic desk, first ionization strength commonly will increase as you circulate left to right throughout a length. that is because of increasing nuclear charge, which results in the outermost electron being greater strongly certain to the nucleus.
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Write the balanced net ionic equation for the reactions that occur when the given aqueous solutions are mixed. Include the physical states. A. Silver nitrate, agno3 , and magnesium bromide, mgbr2.
A silver precipitate is created when silver nitrate, AgNO3, and magnesium bromide, MgBr2, are combined in aqueous solutions.Create the net ionic equation as well as the balanced formula equation for this reaction.
When AgNO3 and MgCl2 are combined, does a solid result?The end products of the reaction between aqueous systems of magnesium chloride (MgCl2) and silver nitrate (AgNO3) are solid silver chloride and aqueous magnesium nitrate.
Which one of the following results in an AgCl and AgNO3 precipitate?The right response is (CH3)3C-Cl.The most reliable 3° carbocation is formed by tert-butyl chloride, or (CH3)3C - Cl.As a result, it will immediately produce the white precipitate of AgCl in AgNO3 solution.
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describe what occurs when a solution forms including which interactions are broken and which interactions are formed
The interactions between the solvent and the solute are either equal to or greater than the interactions between the solvent and the solute.
What is the name of the solution formation process?A solute can dissolve in a solvent to create a solution whether it is in a solid, liquid, or gaseous phase. A solute's solubility is the highest concentration that can dissolve in a solvent at a specific temperature.
When similar molecules of one of the components in a solution interact, what is that process known as?Solvation is the scientific term for the interactions between solute particle and solvent molecule. Ions or molecules that are solvated are encircled by solvent. Photo from Wikimedia Commons of a sodium ion dissolved in water.
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what is the systematic iupac name of the compound below? multiple choice 6-bromo-4-ethylbenzenecarboxylic acid 2-bromo-4-ethylbenzenecarboxylic acid ortho-bromo-para-ethylbenzoic acid 1-bromo-3-ethylbenzoic acid
B. 2-bromo-4-ethyl benzene carboxylic acid. The term "industrial chemical" is short form for "International Union of Pure and Applied Chemistry(iupac).
What are IUPAC guidelines?The IUPAC nomenclature is based on naming the longest continuous or ring-shaped chain of carbon atoms linked by a single bond within a given molecule. Prefixes or suffixes are used in accordance with a predetermined order to identify all deviations, including those involving multiple bonds or atoms other than carbon and hydrogen.
The IUPAC name is it alphabetical?The base name is written first, then the name of the compound is spelt out in alphabetical order (derived from the number of carbons in the parent chain). The name has no spaces in it.
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An 80.0 g sample of a gas was heated from 25 ∘C
to 225 ∘C.
During this process, 346 J of work was done by the system and its internal energy increased by 6265 J.
What is the specific heat of the gas?
The specific heat of the gas is 0.453 J/gº.
What is Specific Heat?
The following method can be used to calculate specific heat values: Heat always transfers from the warmer to the cooler material until both materials reach the same temperature when two materials, each at an initial different temperature, are placed in contact with one another. The heat obtained by the initially colder substance must equal the heat lost by the initially warmer material, according to the law of conservation of energy.
We are aware that when a substance absorbs heat energy, its temperature rises. It is noted that the temperature rise for each substance varies when the same amount of heat is applied to equal masses of various substances.
When we solve for q, we have... q = ∆E - w ∆E = +6905 J w = -346 J (negative value since work was done BY the system, and not on it) (negative value because work was done BY the system, and not on it) q = 6905 - (-346) = 7251 J.
This can now be used to q = mCT.
q = mC∆T
q = 7251 J
80 g of mass is m.
Does C equal specific heat?
T = temperature change equals 225° - 25° = 200°
C=q/(m)T=7251 J/(80.0 g)(200o)
C = 0.453 J/gº
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Consider a general reaction
A(aq)⥫enzyme⥬B(aq)
The Δ°′ of the reaction is −9.660 kJ·mol−1 . Calculate the equilibrium constant for the reaction at 25 °C.
What is Δ for the reaction at body temperature (37.0 °C) if the concentration of A is 1.6 M and the concentration of B is 0.50 M ?
The equilibrium constant for the reaction at 25 °C is 1.3602 . The reaction at body temperature (37.0 °C) if the concentration of A is 1.6 M and the concentration of B is 0.50 M is - 87.287 kJ / mole.
What is equilibrium constant ?Equilibrium constant is defined as a number that illustrates the relationship between the quantities of reactants and products in an equilibrium chemical reaction at a specific temperature.
ΔG° = - 9.660 kJ / mole = 9.660 x 10 ³ J / mole
T = 25 + 273.15 = 298.15 K
ΔG° = - RT ln K
ln K = -ΔG° / RT
ln K = - ( - 9.660 x 10 ³ J / mole ) / 8.314 J / k . mole X 298.15 K
ln K = 3.8970
K = 1.3602
T = 37 + 298.15 = 310.15 K
ΔG = ΔG° + RT ln Q
Where Q = 0.55 / 1.6 = 0.34375
ΔG = -9.660 X 10³ + [ 8.314 x 310.15 x ln ( 0.34375 )]
ΔG = - 87287.34 J / mole
ΔG = - 87.287 kJ / mole
Thus, the equilibrium constant for the reaction at 25 °C is 1.3602 . The reaction at body temperature (37.0 °C) if the concentration of A is 1.6 M and the concentration of B is 0.50 M is - 87.287 kJ / mole.
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HELP PLS
The half-life of sodium-25 is 1.0 minute. Starting with 1 kg of this isotope, how much will remain after half an hour?
The amount of the sodium-25 that will remain after half an hour, given that it has a half life of 1.0 minutes is 5.0×10⁻³¹ Kg
How do I determine the amoun remaining after half hour?To obtain the amount that will remain after half hour, we'll begin by obtaining the number of half lives that has passed. Details below:
Half-life (t½) = 1.0 minuteTime (t) = 1/2 hour = 30 minutesNumber of half-lives (n) =?n = t / t½
n = 30 / 1
n = 30
Now, we shall determine the amount that will remain after half hour. This is shown below:
Number of half-lives (n) = 30Original amount (N₀) = 1 KgAmount remaining (N) = ?N = N₀ / 2ⁿ
N = 1 / 2³⁰
N = 5.0×10⁻³¹ Kg
Thus, from the above calculation, we can conclude that the amount that would remain is 5.0×10⁻³¹ Kg
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a chem 10 student dissolves 2.45 g of sugar in 200.0 g water. what is the mass percent of sugar in the solution?
A student dissolves 2.45 g of sugar in 200.0 g water. the mass percent of sugar in the solution is 1.22 %.
given that :
the mass of the solute = 2.45 g
the mass of the solution = 200 g
The mass percent formula is given as follows :
The mass % = ( mass of solute / mass of the solution ) × 100 %
The mass % = ( 2.45 / 200 ) × 100 %
The mass % = 1.22 %.
Thus the mass percent of the 2.45 g of sugar dissolves in 200 g of the water is 1.22 %.
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periodic scavenger hunt what color element symbol designates elements that are a gas at a given temperature
Red color element symbols indicate elements that are gases at a specific temperature in periodic scavenger hunts.
What exactly is an element?An element is a basic substance that is hard to break down into smaller pieces. In chemistry and physics, an element is anything that cannot be further separated by non-nuclear processes. In computers and mathematics, an element is a discrete part of a larger structure or collection.
What does element mean?Any compound that cannot be broken down into simpler chemicals by regular chemical processes is referred to as a chemical element or element. The building blocks from which every matter is made are called elements.
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What type of heat transfer happens
Answer:
Explanation:
14. radiation
15. thermal conductivity
16. conduction
17. convection
0. Three kids were tossing balls into the pool. They noticed that the heights of the waves
were affected by which ball they tossed into the water. Their observations are recorded in
the table below. Explain how the amplitude of a wave is related to its energy. Include a
drawing or sentence that describes the energy transfer(s) and transformation(s) that
occurs to produce the waves in this scenario.
Answer: The higher the amplitude, the higher the energy.
Explanation: The higher the amplitude, the higher the energy. To summarise, waves carry energy. The amount of energy they carry is related to their frequency and their amplitude. The higher the frequency, the more energy, and the higher the amplitude, the more energy.
Using the balanced equation given below, calculate the number of moles of KCl produced along with 0.45 moles of O2. moles KCl *GIve your answer to the correct number of significant digits!
2 KClO3 --> 2 KCl + 3 O2
According to the law of conservation of mass and stoichiometry, number of moles of KCl produced along with 0.45 moles of oxygen is 2 moles of KCl.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
As according to the equation, 245.1 g of potassium chlorate produces 149.1 g of KCl and 48 g of oxygen
∴245.1 g of potassium chlorate produces 244.65 g of KCl along with 7.2 g of oxygen .
In terms of moles, 2 moles of potassium chlorate produces 2 moles of KCl as number of moles=mass/molar mass that is, 149.1/74.55=2
Thus, the number of moles of KCl produced is 2 moles.
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Lipids, proteins, carbs... What's the difference?
Lipids are more of a fatty, oily, and waxy substance that serve as long-term energy for whenever the body may need it. You can find lipids in oily foods such as salad dressing, olives, avocados, peanut butter, nuts, seeds, and some fish.
Proteins are enzymes that are used to strengthen and keep the body functioning. Proteins make up our bones, hair, skin, nails, and muscle, and without them our bodies wouldn't be strong enough to function or carry out even the simplest of tasks. Proteins are found in more animal-based foods such as meat, vegetables, grains, and seeds.
Carbohydrates are more of the sugary molecules that provide short-term or immediate energy for the body. They can be found in foods like bread, beans, milk, popcorn, potatoes, cookies, spaghetti, and soft drinks.
in each reaction box, place the best reagent and conditions that give the following alkene as the major product.
The conditions for alkene as a major product is attaching EWG with a aromatic compounds.
In the event that hydrogen is added to the tertiary carbon of an alkene, secondary carbocation is also a scenario that may arise; however, tertiary cation is more stable than secondary. Alkene is the end product following the release of H. A significant product is more substituted alkene.
We frequently overlook the ion concentration in water for the same reason that we frequently ignore the electron mass (we just add the protons and neutrons) due to their tiny size. The -log(conc) cannot be taken in this case.
The substituted alkane must have a low leaving group for E1cB to take place. The E1cB reaction is favored by strong EWG at the carbon and a weak leaving group. One of its beta carbons must also have a hydrogen on it. Fluorine, a poor leaving group, is present in reactant.
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This question has two parts
(I recommend you answer in CER Strategy to help me earn extra points.)
(I need you help ASAP!)
(Use data and text as evidence)
Text:
In animal populations, genes help determine when organism will breed during the year. Scientists have observe that the distribution of the time of year breeding genes in animal populations has been changing as average global temperatures increase. Red squirrels in Canada are one example of a population that has shown a shift in the frequency of certain genes. Scientists have observed the genes related to breeding earlier in the spring increasing in red squirrel populations. The chart shown below provide some information about red squirrels.
The data about red squirrels:
- Red squirrels frequently produce once a year
- Mating season is spring
- Red squirrels don't hibernate, but they store food for winter because food is less available
- Their diet is mostly herbivorus; sometimes eat insects, eggs, small birds/mammals
Part A: Describe ONE survival advantage for red squirrels to breed earlier in the spring.
Part B: Identify and explain the mechanism by which the gene for breeding earlier in the spring can increase in the red squirrel population over time.
Answer:
Part A: One survival advantage for red squirrels to breed earlier in the spring is that they may be able to take advantage of an earlier availability of food resources. As the climate warms and average temperatures increase, plants may begin to grow and produce food earlier in the year. By breeding earlier in the spring, red squirrels may be able to access these food resources before they become scarce, which could improve the survival and reproductive success of their offspring.
Part B: The mechanism by which the gene for breeding earlier in the spring can increase in the red squirrel population over time is natural selection. Natural selection is the process by which certain traits become more or less common in a population based on their impact on an individual's ability to survive and reproduce. If red squirrels that breed earlier in the spring are more successful at surviving and reproducing than those that breed later, then the genes for early breeding will become more common in the population over time. This process can occur over many generations, leading to a shift in the distribution of the time of year breeding genes in the population.
if your chemistry grade is broken down so that 40% of it is based on homework, 40% on lab reports, and 20% on exams, and your average scores (out of 100 points in each area) are homework–95, labs–83, and exams–77, what would your weighted average be?
95 marks in 100 means you scored 95 % in homework. Similarly 83% in labs and 77% in exams. Thus the weighted average will be 85 %.
What is average?Average of a set of values is their sum divided by their number. The average of a set with even number of values, will be their sum divided by number where the average comes in a range of the set of values.
Average of odd number of values will be the exact middle value of the set.
Given that marks in homework out of 100 = 95
labs = 83
exams = 77.
Thus, average of your marks percentage = (77 + 83 + 95)/3
= 85%.
Therefore, the average percentage of the marks is 85%.
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A 100mL solution contains 0.07 total moles of acid, it is a mixture of hydrochloric (HCl) and sulfuric (H2SO4) acid and requires 50mL of 2M NaOH to be titrated to its equivalence point. What were the molar concentrations of the two acids?
The molar concentrations of the two acids is Hcl = 0.4 M, NaOH = 0.3 M.
What is Molarity?
The ratio of the solute molecular weight to the length of the solution is known as molarity. By dividing the number of moles of HCl by the volume (L) of the solution in which it was dissolved, we may determine the molarity of the acid solution.
What is moles?
Chemists utilise a mole, a very significant unit of measurement. Similar to how having a dozen eggs indicates you have twelve eggs, having a mole of anything means you have 602,214,076,000,000,000,000,000 of that thing. When measuring extremely small objects like atoms, molecules, or other particles, chemists must use moles.
Let a be moles of Hcl
Let b be moles of H₂SO₄
and we are given total moles of acid to be 0.07
SO a+b= 0.07 ⇒ 1
acid to titration, if
NaOH reacts with Hcl = a moles of NaOH is required
If NaOH reacts with H₂SO₄ = 2b moles of NaOH are required
so and we are given
NaOH = 50 ml and 2 Hsol
no.of moles
nNaOH = 10/100 = 0.1 moles
so a+2b = 0.1 moles ⇒2
solving 1 and 2
b= 0.03 moles
b= 0.03
a= 0.04
molar acids of two concentrations are given
n Hcl = 0.04 moles
n NaOH = 0.03 moles
molar concentration of Hcl = 0.04* 100/100*100 = 0.4
Molarity of Hcl = 0.4 M
Molar concentration of NaOH = 0.03*100/100*100 = 0.3
Molarity of NaOH = 0.3 M
Therefore, the molar concentrations of the two acids is Hcl = 0.4 M, NaOH = 0.3 M.
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What organelles can only be seen in detail using an electron
microscope?
a balloon contains 0.76 mol n2, 0.18 mol o2, 0.031 mol he and 0.026 mol h2 at 749 mm hg. what is the partial pressure of o2?
A balloon contains 0.76 mol n2, 0.18 mol o2, 0.031 mol he and 0.026 mol h2 at 749 mm hg is 140mmH.Each gas that makes up a mixture of gases has a partial pressure.
According to Dalton's Law, a perfect gas mixture's total pressure equals the sum of its constituent gases' individual partial pressures. The thermodynamic activity of a gas's molecules is gauged by its partial pressure. Gases react, disperse, and dissolve based on their partial pressures rather than the concentrations they have in liquids or other gas combinations. This characteristic of gases generally holds true for biological gas chemical processes.
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The heat of combustion for sugar is 5639 kJ/mole, but that for TNT is 3406 kJ/mole. Why, if the heat of combustion for TNT is smaller than for sugar, is TNT an explosive?
The heat of combustion for TNT( 3406 kJ/mole) is smaller than that of sugar (5639 kJ/mole) because TNT is an explosive material.
Why is heat of combustion for TNT smaller than for sugar?As sugar is a non electrolyte, it is comparatively more stable. That is why, more energy is required to decompose the sugar. Therefore, heat of combustion value is 5639kJ/mol which is high.
The heat of combustion of TNT is about 3406 kJ/mol and this value is a good indicator of the energy available from the detonation of TNT.
TNT is sometimes used as a reagent in chemical synthesis, but is best known as an explosive material with convenient handling properties.
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if on an average a teflon polymer has 100,000 monomer units and each monomer of teflon has the formula c2f4, what is the molar mass of the polymer?
Molar mass of teflon polymer is 1,20,00,000. if on an average a teflon polymer has 100,000 monomer units and each monomer of teflon has the formula c2f4 =120.0g/mol.
How to solve?no of monomer in teflon polymer is 100,000 monomer units ,
and the formula of teflon is c2f4,
now the molar mass of monomer c2f4 is 100.02 g/mol then,
for 100,000 monomer units = 120.0*100,000 = 1,20,00,000 g/mol
Molar mass of teflon polymer is 1,20,00,000 g/mol.
What does C8 do to Teflon?The two that have received the attention are PFOA (also known as C8), which has been used for many years to manufacture Teflon non-stick, and PFOS, which is used to make Scotchgard water repellent. They don't degrade. PFAS are persistent and build up over time in both people and animals as well as in the environment.
Give a definition of polymerization and an equation.The joining of hundreds of ethylene molecules to produce polyethylene is an illustration of the first type of reaction. Other addition polymers include polypropylene, which is created by polymerizing H2C=CHCH3, polystyrene, which is created from H2C=CH C6H5, and polyvinyl chloride, which is created from H2C=CHCl.
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