The solution to this question is option d. We can calculate it in this manner:
By using Raoult's Law:
Pi= Pi* Xi
Moles H20= (200g of H2O x 1 mol)/ 18.02 g of H20
=11.0987 mol H2O
Moles of NaCl= (50g of NaCl x 1 mol)/ 58.4427 mol NaCl
Now to calculate vapor pressure,
Mole fraction of H20= (Moles of H20)/ (Moles H20 + Moles of NaCl)
= 11.0987/ 11.95414
=0.92844
Partial pressure of solution is,
Pi= 0.92844 x 0.031
=0.2878 atm
Therefore vapor pressure of the solution is 0.2878 atm
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How do you read Lehninger's Principles of Biochemistry?
Take up the book to read, look over the contents, read the introduction and conclusion, and then read a few sections from the main body. Finally, since this is your first reading, read the book cover to cover without making any notes or checking anything up.
To read Lehninger's Principles of Biochemistry, you should follow these steps:
1. Begin by reading the introduction to each chapter to get an overview of the main concepts and themes that will be covered.
2. Look at the chapter headings and subheadings to get an idea of the organization of the material.
3. Pay attention to any diagrams or tables that are included, as these can help to visualize complex concepts.
4. Take notes as you read, and make sure to highlight any key terms or important concepts.
5. Practice problems and review questions at the end of each chapter can also help to reinforce your understanding of the material.
By following these steps, you can effectively read and understand Lehninger's Principles of Biochemistry.
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of the halogen family, fluorine, chlorine, bromine, and iodine, which would you expect not to produce a positive beilstein test result?
The Beilstein test is a test for halogens, which identifies the presence of halogens in an organic compound. The test is based on the observation that halogen atoms produce a green flame when a compound containing halogens is introduced into a flame.
Of the halogens in the halogen family (fluorine, chlorine, bromine, and iodine), fluorine is the halogen that would not produce a positive Beilstein test result. This is because fluorine is so reactive that it will react with the copper wire used in the test, preventing the green flame from being produced. In contrast, chlorine, bromine, and iodine will react with the copper wire to produce a green flame, indicating the presence of halogens in the compound being tested.
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All parts of the question.
The substance which is totally consumed when the chemical reaction is complete is known as the limiting reactant. Here HgO is the limiting reactant.
What is theoretical yield?The amount of the product which is predicted by the stoichiometry is called the theoretical yield. A reaction yield is reported as the percentage of the theoretical amount.
% yield = Actual yield / Theoretical yield × 100
a. 11.50 × 1 mol HgO / 216.6 × 1 mol HgCl₂ / 1 mol HgO × 271.5 g HgCl₂ / 1 mol HgCl₂ = 14.41 g HgCl₂
12.46 g Cl₂ × 1 mol Cl₂ / 70.90 g × 1 mol HgCl₂ / 2 mol Cl₂ × 271.5 g HgCl₂ / 1 mol HgCl₂ = 23.85 g HgCl₂
So HgO is the limiting reactant.
b. 11.50 × 1 mol HgO / 216.6 × 1 mol Cl₂O / 1 mol HgO × 86.90 g Cl₂O / 1 mol Cl₂O = 4.61 g Cl₂O
c. 2.99 / 4.61 × 100 = 64.85 %
d. Moles of Cl₂ available - Moles of Cl₂ required = 0.1757 - 0.01062 = 0.1651 moles.
Thus HgO is the limiting reactant.
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are there any places on earth where the mid-oceanic ridges meet the continent?
Answer:
Yes, there are places on earth where mid-oceanic ridges meet the continents. These areas are known as "continental rift zones" or "divergent plate boundaries," and they occur where tectonic plates are pulling away from each other, causing a rift or a valley to form. As the continental crust thins and stretches, it may be separated by a mid-oceanic ridge or a seafloor spreading center.
One example of a place where a mid-oceanic ridge meets a continent is the East African Rift. This is a divergent boundary where the African Plate is splitting into two parts, and a new ocean is beginning to form. The rift runs through several countries in eastern Africa, including Ethiopia, Kenya, Tanzania, and Mozambique. Another example is the Red Sea, which is a young ocean that formed as the Arabian Plate separated from the African Plate along a divergent boundary.
So, in summary, there are several places on earth where the mid-oceanic ridges meet the continents, forming rift zones or divergent plate boundaries.
What is the Lewis structure of HNO2?
The central N atom in the HNO₂ Lewis structure is sp² hybridized.
The hybridization of N is calculated by the following formula,
H = 0.5(V+M-C+A), where H= hybridization value, V is the number of valence electrons in the central atom, M = monovalent atoms surrounded, C=no. of cation, A=no. of the anion.
H is an s block element with the valence orbital of s and the electronic configuration 1s1. The s block element should fill its s orbital by two electrons in accordance with the octet rule because the s orbital can only hold a maximum of two electrons according to Hund's rule of multiplicity.
To create a strong covalent bond, H and O each share one electron. Now that a bond has been shared, H has two electrons in its valence orbital, completing its octet.
Given that the s orbital only has two electrons and the p orbital has a maximum capacity of six electrons due to its three subshells, the p block element's valence shell should be completed by six electrons.
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Hydrogen and oxygen react under a specific set o conditions to produce water according to the following: 2H2(8) + 02(8) -> 2H20(8).
a. How many moles of hydrogen would be required to produce 5.0 mol of water?
b. How many moles of oxvgen would be required?
Answer:
a. To produce 5.0 mol of water, we need to know the number of moles of hydrogen involved in the reaction. The chemical equation 2H2(g) + O2(g) -> 2H2O(g) tells us that 2 moles of hydrogen react with 1 mole of oxygen to produce 2 moles of water. So, to produce 5.0 mol of water, we need 2.5 moles of hydrogen.
b. If we know the number of moles of hydrogen, we can calculate the number of moles of oxygen required for the reaction. The chemical equation tells us that 2 moles of hydrogen react with 1 mole of oxygen, so if we have 2.5 moles of hydrogen, we would need 1.25 moles of oxygen.
how to calculate moles to atoms?
The moles to the atom is that 1 atom of the substance is equals to the 1/ 6.022 × 10²³ moles.
The value of the mole is exactly equal to the number of the atoms in the exactly 12 grams of the pure carbon-12. The 12.00 g C-12 is equals to the 1 mol C-12 atoms and this equals to the 6.022 × 10²³ atoms . The number of particles of the substance in the 1 mole is called as the Avogadro's Number.
The Avogadro's number = 6.022 × 10²³
The number of the moles to the atoms = 1/ 6.022 × 10²³ moles.
The number of the moles is also expressed as :
The number of the moles = mass / molar mass
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Identify the color absorbed by a solution that appears the color given.
1. Blue=
2. Red=
3. Orange=
4. Green=
A solution that appears blue absorbs orange and that appears red absorbs green and the solution that appears orange absorbs blue and that appears in green absorbs red.
A solution that appears blue absorbs light in the orange range of the visible spectrum.
• A solution that appears red absorbs light in the green range of the visible spectrum.
• A solution that appears orange absorbs light in the blue range of the visible spectrum.
• A solution that appears green absorbs light in the red range of the visible spectrum
The color absorbed by a solution depends on the specific properties of the solute and the solvent in the solution, as well as the wavelength of the light passing through it. When light passes through a solution, certain wavelengths may be absorbed by the solute molecules in the solution, causing the solution to appear colored.
The color that is absorbed by a solution can be determined using a spectrophotometer, which measures the absorbance of light at various wavelengths. The absorbance spectrum of a solution can be used to determine the concentration of a solute in a solution, as well as other properties of the solution, such as its purity and chemical composition.
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If 5 moles of hydrogen gas reacts with excess nitrogen gas, how many grams of ammonia gas will be produced?
The mass (in grams) of ammonia, NH₃ that will be produced when 5 moles of hydrogen reacts is 56.61 grams
How do I determine the mass of ammonia produced?First, we shall obtain the moles of ammonia produce from the reaction. Details below:
N₂(g) + 3H₂(g) -> 2NH₃(g)
From the balanced equation above,
3 moles of H₂ reacted to produce 2 moles of NH₃
Therefore,
5 moles of H₂ will react to produce = (5 × 2) / 3 = 3.33 moles of NH₃
Finally, we shall determine the mass of ammonia, NH₃ produced from the reaction. Details below:
Mole of ammonia, NH₃ = 3.33 moles Molar mass of ammonia, NH₃ = 17 g/mol Mass of ammonia, NH₃ =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of ammonia, NH₃ = 3.33 × 17
Mass of ammonia, NH₃ = 56.61 grams
Thus, the mass of ammonia, NH₃ is 56.61 grams
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a chemical equation is a statement using chemical that expresses both the identities and the relative of the reactants and products involved in a chemical or physical change.
A chemical equation is a statement using chemical formulas that express both the identities and the relative quantity of the reactants and products involved in a chemical or physical change.
The chemical equation is said to be balanced if there are no inequalities.
The relative quantity is generally an absolute quantity divided by some other quantity. For example, in the previous excel file, one could calculate the percent of the adult population infected with HIV by dividing the number of adults with HIV by the total adult population of the country.
The main four types of reactions are direct combination, analysis reaction, single displacement, and double displacement.
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What is the empirical formula of C4H8O2
Answer:
Explanation:
The empirical formula of a compound is the simplest whole-number ratio of the atoms that make up the compound. To find the empirical formula of a compound, you first need to determine the number of atoms of each element in the compound.
For C4H8O2, there are 4 carbon atoms, 8 hydrogen atoms, and 2 oxygen atoms. To simplify the ratio to its simplest form, divide each of these numbers by the greatest common factor, which is 2 in this case. The empirical formula is then:
C4H8O2 ÷ 2 = C2H4O1
So the empirical formula of C4H8O2 is C2H4O1.
Which of these equations represents the second ionization of magnesium?
A Mg+(g) → Mg2+(g) + e−
B Mg(g) → Mg2+(g) + 2e−
C Mg+(g) + e− → Mg2+(g)
D Mg(g) + 2e− → Mg2+(g)
The equation that represents the second ionization of magnesium is option D: Mg(g) + 2e- → Mg2+(g).
In the first ionization of magnesium, one electron is removed from the neutral magnesium atom to form a magnesium cation, Mg+. In the second ionization, another electron is removed from the magnesium cation to form a magnesium dication, Mg2+. The equation for this process is D, Mg(g) + 2e- → Mg2+(g).
Option A, Mg+(g) → Mg2+(g) + e-, represents the formation of a magnesium cation from a magnesium dication and an electron, which is the reverse process of the second ionization.
Option B, Mg(g) → Mg2+(g) + 2e-, represents the formation of a magnesium dication from a neutral magnesium atom, which is the correct process for the second ionization.
Option C, Mg+(g) + e- → Mg2+(g), represents the formation of a magnesium dication from a magnesium cation and an electron, which is not a second ionization.
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What allows us to convert from moles of one substance to moles of another substance? a) Formula mass b) Molecular mass c) A balanced chemical equation d) A conversion table
The moles of any two substances involved in a chemical reaction are connected by a conversion factor called a mole ratio. The numbers in a conversion factor are provided by the coefficients of the balanced chemical equation.
What is Molecular mass?A given molecule's mass, expressed in daltons, is known as its molecular mass. Because various isotopes of an element are present in distinct molecules of the same substance, their molecular weights might vary. The mass of 6.022 10 23 atoms, molecules, or formula units of a substance are equal to its molar mass, which is the mass of 1 mole of that substance represented in grams per mole. A unit used to describe the masses of individual atoms and molecules is the atomic mass unit (u). The weighted average of the masses of an element's isotopes, or atomic mass, is calculated. The combined masses of a molecule's atoms make up its molecular mass.To learn more about Molecular mass, refer to:
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In H-NMR spectroscopy, which factor determines the shape of the spectra? the number of protons in the macromolecule the energy of a proton's a spin state the transition between a proton's a and B spin states the energy of a proton's B spin state
Factor which determines the shape of the spectra in NMR spectroscopy is b) transition between a proton's α and β.So,correct option is b.
Proton nuclear magnetic resonance (proton NMR, hydrogen-1 NMR, or 1H NMR) is the use of atomic attractive reverberation in NMR spectroscopy as for hydrogen-1 cores inside the particles of a substance, to decide the design of its molecules.[1] In examples where regular hydrogen (H) is utilized, essentially all the hydrogen comprises of the isotope 1H (hydrogen-1; for example having a proton for a core).
Proton NMR spectra of most natural compounds are described by compound changes in the reach +14 to - 4 ppm and by turn coupling between protons. The combination bend for every proton mirrors the wealth of the singular protons.Basic particles have straightforward spectra. The range of ethyl chloride comprises of a trio at 1.5 ppm and a group of four at 3.5 ppm in a 3:2 proportion. The range of benzene comprises of a solitary top at 7.2 ppm because of the diamagnetic ring current.
Hence,correct option is b.
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(Complete question) is:
In NMR spectroscopy, which factor determines the shape of the spectra?
a)the energy of a proton's β spin state
b)the transition between a proton's α and β spin states
c)the number of protons in the macromolecule
d)the energy of a proton's α spin state
What is a polyatomic ion definition?
Cecile packages snack mix at a health food store. She uses 13 1 3 of her supply of sunflower seeds to make a salted snack mix and 29 2 9 of her supply to make an unsalted snack mix. If cecile uses 10 pounds of sunflower seeds, how many pounds of seeds are in her supply?.
The number of pounds of seeds in her supply is 18 if she uses 1/3 supply to make a salted snack.
The sunflower seed is the seed of the sunflower (Helianthus annuus). There are three types of normally utilized sunflower seeds: linoleic (generally normal), high oleic, and sunflower oil seeds. Every assortment has its own one of a kind degrees of monounsaturated, immersed, and polyunsaturated fats.
Firstly,we need to assume her total supply of sunflower seeds are x
If total supply of seeds are x,in that case
Supply of salted snack = 1/3x
and Supply of unsalted snack = 2/9x
It is given that total pounds of sunflower seed = 10
So,total supply of sunflower seeds is equal to sum of salted snack and unsalted snack.
In other words,Total supply of sunflower seeds = salted snack + unsalted snack
10 = 1/3x + 2/9x
10 = (3x + 2x) / 9
10 = 5/9x
On dividing both sides by 5/9
x = 10 ÷ 5/9
x = 10 × 9/5
x= (10 × 9) / 5
x= 90/5
x= 18
Hence, number of pounds of seeds in her supply is 18
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Barium metal was quantitatively precipitated from a 1.52 g sample of BaCl2â2H2O. The mass of the barium that was collected was 0.844 g. Calculate the experimental mass percent of barium in the sample.Calculate the theoretical mass percent of barium in BaCl2â2H2O.
This same sample's experimental mass percentage containing barium is 55.526.
What does barium do to the body?Barium compounds which dissolved in water or the stomach when consumed in very large quantities might cause human paralysis or heart rhythm abnormalities. Some people who consumed or drank a significant amount of barium but failed to seek medical attention immediately perished.
Given that a 1.52 g sample of BaCl22H2O quantitatively precipitated barium metal.
This barium that was gathered had a mass of 0.844 g.
We must ascertain the sample's experiment mass percent of barium
Let the barium content be expressed as x/100.
x/100×1.52=0.844
0.0152x=0.844
x=55.526
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Question 1-14
How does the carbon cycle support the Law of Conservation of Mass?
O The total amount of carbon decreases, as it moves through the carbon cycle.
O
The total amount of carbon does not change as it moves through the carbon cycle.
O The total amount of carbon gradually increases, as it moves through the carbon cycle.
The total amount of carbon changes depending on where it's located in the carbon cycle.
According to law of conservation of mass, the carbon cycle supports the law of conservation of mass as the total amount of carbon does not change as it moves through the carbon cycle.
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.
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How many c4h10 molecules are contained in 9. 213 g of this compound? how many hydrogen atoms?.
The number of C4H10 molecules and hydrogen atoms in 9.213 g of this compound is 9.48 x 10^23. This can be calculated by using the molecular weight and Avogadro's number.
The molecular weight of C4H10 can be calculated as :
4 x 12.01 + 10 x 1.01 = 58.12 g/mol.Dividing the mass of the sample (9.213 g) by the molecular weight gives us the number of moles of C4H10:
9.213 g ÷ 58.12 g/mol = 0.158 moles.Avogadro's number, which is approximately 6.022 x 10^23, can then be used to calculate the number of C4H10 molecules in the sample:
0.158 moles x 6.022 x 10^23 molecules/mol = 9.48 x 10^22 molecules.The number of hydrogen atoms in the sample can be calculated by multiplying the number of C4H10 molecules by the number of hydrogen atoms in each molecule, which is 10:
9.48 x 10^22 molecules x 10 hydrogen atoms/molecule = 9.48 x 10^23 hydrogen atoms.Learn more about Hydrogen Atoms:
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what property of water cause water to form a curved shape on the penny?
The property of water that causes it to form a curved shape on a penny is surface tension.
Surface tension is the cohesive force that exists between the water molecules at the surface of the liquid, causing them to stick together and form a "skin" or surface film. This property arises due to the hydrogen bonding between water molecules, which creates a net inward force that reduces the surface area of the liquid, making it behave as if it has an elastic film stretched across it.
When a penny is placed on a flat surface and water droplets are added to it, the surface tension of the water causes it to form a nearly spherical shape on the penny. The cohesive forces of the water molecules pull the liquid into a shape with the least amount of surface area, which is a sphere, and the penny acts as a support that helps maintain the spherical shape of the water droplet. This surface tension phenomenon can be observed in various everyday situations, such as the formation of raindrops or the behavior of soap bubbles.
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Menthol, C10H200, is a compound often
used in creams and lotions for muscle
aches. If there are 10.0 grams of menthol
in a cream, how many hydrogen atoms
are in the menthol sample?
[?] x 10¹²] atoms H
Enter the coefficient in the green blank and the
exponent in the yellow blank. Report your answer
to the appropriate number of significant figures!
Coefficient (green)
Exponent (yellow)
Enter
There are approximately 1.28 x 10²³ hydrogen atoms in 10.0 grams of menthol.
What is menthol?Menthol is chemical compound that is found naturally in peppermint and other similar plants.
molar mass of menthol = (10 x 12.01) + (20 x 1.01) + (2 x 15.99) = 156.27 g/mol
moles of menthol = mass of menthol / molar mass of menthol
moles of menthol = 10.0 g / 156.27 g/mol = 0.0639 mol
number of hydrogen atoms = moles of menthol x number of hydrogen atoms per mole
So, number of hydrogen atoms = 0.0639 mol x 20 = 1.28 mol
Therefore, there are approximately 1.28 x 10²³ hydrogen atoms in 10.0 grams of menthol.
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How to balancing a reaction ?
To balance a chemical reaction, you need to make sure that the number of atoms of each element is the same on both sides of the equation.
Here are the steps to balance a reaction:
1. Write the unbalanced equation using the correct chemical formulas for all the reactants and products.
2. Count the number of atoms of each element on both sides of the equation.
3. Use coefficients (numbers in front of the chemical formulas) to balance the number of atoms of each element. Start with the element that appears the least number of times in the reaction.
4. Check to make sure that the number of atoms of each element is the same on both sides of the equation.
5. Simplify the coefficients if possible (for example, if all the coefficients are divisible by 2, divide them all by 2 to simplify).
Here is an example:
Unbalanced reaction: H₂ + O₂ → H₂O
1. Count the number of atoms of each element:
H: 2 on the left, 2 on the right
O: 2 on the left, 1 on the right
2. Use coefficients to balance the number of atoms of each element:
H₂ + O₂ → 2H₂O
3. Check to make sure that the number of atoms of each element is the same on both sides of the equation:
H: 2 on the left, 4 on the right
O: 2 on the left, 2 on the right
4. Simplify the coefficients if possible:
The coefficients are already as simple as possible, so the balanced reaction is: H₂ + O₂ → 2H₂O
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Name the smallest particle of an element that can retain all the chemical properties.?
Atom is the smallest particle of an element that can retain all the chemical properties.
Atom is defined as the smallest part of a substance that cannot be broken down through chemical process. Each atom contains a nucleus (which is its center, and nucleus is made up of protons (positive particles) and neutrons (particles with no charge). Electrons which are negative charged particles, move around the nucleus.
Generally, the electrons which are associated with atoms are found to have measurable properties which exhibit quantization. The electrons are basically found in quantized energy states of the lowest possible energy for the atom, known as ground states.
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how many molecules of water are needed to completely hydrolyze a polymer that is ten monomers long?
Nine, with each coupled pair of monomers requiring the hydrolysis of one water.
What is meant by hydrolyze?In general, hydrolysis refers to the breaking of chemical bonds brought about by the presence of water and entails the reaction of an organic compound with water to produce two or more new chemicals.Any chemical reaction in which a water molecule breaks one or more chemical bonds is referred to as hydrolysis. The phrase is commonly used to refer to substitution, elimination, and solvation reactions in which water serves as the nucleophile. Using water to break down a binding is known as hydrolysis.The word "hydrolyze" comes from the Greek words hydro and lysis, which mean "water break." Water (or H2O) separates into two components: a positive hydrogen atom, H+, and a negative hydroxide atom, (OH)-. The word "hydrolysis" literally means "water reaction."To learn more about hydrolyze refer to:
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Which has the most thermal energy?
Answer:
Explanation:
If all other conditions are the same, substances in gas form have the most thermal energy, followed by liquids, then solids. Temperature can be measured with a thermometer. The matter inside a thermometer expands as its particles gain thermal energy and move.
how to convert moles to atoms calculator?
By using the relation, Atoms = Moles × 6.022×10²³ , we can convert moles to atoms calculator.
What is atom?The smallest unit of matter that may be divided without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The rest is made up of an accumulation of electrons that are negatively charged surrounding a nucleus with a positive charge made up of protons and neutrons. Compared to electrons, whose happen to be the lightest charged substances in nature, the nucleus relatively small and dense. By using the relation, Atoms = Moles × 6.022×10²³ , we can convert moles to atoms calculator.
Therefore, by using the relation, Atoms = Moles × 6.022×10²³ , we can convert moles to atoms calculator.
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Is NH4+ polar or nonpolar?
The NH4+ molecule is polar.
Polar molecules are those that have an uneven distribution of charge, resulting in a positive and negative side. Nonpolar molecules, on the other hand, have an even distribution of charge and do not have distinct positive or negative sides.
In the case of NH4+, the molecule has a positive charge due to the presence of an extra hydrogen atom. This extra hydrogen atom creates an uneven distribution of charge, making the molecule polar.
Additionally, the four hydrogen atoms are arranged in a tetrahedral shape around the central nitrogen atom, further contributing to the molecule's polarity. Therefore, NH4+ is a polar molecule.
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what is the bromic acid formula?
The formula of the bromic acid is HBrO₃. IT is also called as the hydrogen bromate.
The Bromic acid, that is also known as the hydrogen bromate, is the type of the oxoacid with the molecular formula of HBrO₃. It will only exists in the aqueous solution. It is the colorless solution that will turns the yellow at the room temperature as it will decomposes to the bromine.
The bromic acid is stable only when in the very dilute solutions, it is usually produced by reaction of the barium bromate with the sulfuric acid. It is used as the oxidizing agent in the manufacture of the dyes and the pharmaceuticals.
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When white light strikes this object, the light is completely absorbed, with none of it transmitted or reflected. Which type of object
could this be? (1 point)
O a black piece of paper
O a white sheet of plastic
O a green long-sleeved shirt
O a clear windowpane
The type of object that completely absorbs white light would be a black piece of paper. First option.
What are black bodies?Black bodies are objects that completely absorb all the components of white light.
White light is a mixture of different colors of light, each with a different wavelength and frequency.
When white light strikes a black body, the black body absorbs a large fraction of all the different colors, regardless of their wavelength. This absorption causes the light to be transformed into thermal energy, which increases the temperature of the black body.
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an nacl solution is prepared by dissolving 20.0 g nacl in 150.0 g of water at 25°c. what is the vapor pressure of the solution if the vapor pressure of water at 25°c is 23.56 torr?
The vapor pressure of the NaCl solution is 22.66 torr.
What is Vapor Pressure?
It is the result of molecules escaping from the surface of a liquid or solid and entering the gas phase. The vapor pressure is dependent on the temperature and the intermolecular forces between the molecules. As the temperature increases, the vapor pressure of a substance increases as well.
To calculate the vapor pressure of the NaCl solution, we can use Raoult's law, which states that the vapor pressure of a solution is proportional to the mole fraction of the solvent in the solution:
P = X_solvent * P°_solvent
where P is the vapor pressure of the solution, X_solvent is the mole fraction of the solvent (water), and P°_solvent is the vapor pressure of pure water.
moles of NaCl = mass of NaCl / molar mass of NaCl
moles of water = 150.0 g / 18.015 g/mol = 8.326 mol
moles of NaCl = 20.0 g / 58.44 g/mol = 0.342 mol
total moles = moles of water + moles of NaCl = 8.326 mol + 0.342 mol = 8.668 mol
X_water = moles of water / total moles = 8.326 mol / 8.668 mol = 0.962
P = X_water * P°_water
P = 0.962 * 23.56 torr = 22.66 torr
Therefore, the vapor pressure of the NaCl solution is 22.66 torr.
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