Which solution has the highest vapor pressure? a. 20.0 g of glucose (C 6 H 12 O 6 ) in 100.0 mL of water b. 20.0 g of sucrose (C 12 H 22 O 11 ) in 100.0 mL of water c. 10.0 g of potassium acetate KC 2 H 3 O 2 in 100.0 mL of water

Hi everyone today, we have a question telling us among the falling identify the solution that has the smallest vapor pressure. A 30 g of sodium chlorate and 200 ml of water. B 50 g of cyclo oxygen all in 200 ml of water Or C 50 g of one Hempton, all in 200 ml of water. So assuming that there is an ideal solution, we're going to obey routes law, which is peace solution equals X solvent times pressure of solvent. So the X solvent equals moles of solvent divided by I times moles of solute plus moles of solvent. So starting with a We have 30 g of sodium chlorate and 200 ml of water in A. c. l. 0. 3 is an electrolyte. So our I equals two. Our molar mass is 106 0. grams per mole. R. i. equals two moles of particle perm. Als assault has close molar mass with the others. Makes it have the lowest VP B. We have 50 g of cyclo octane. All In 200 ml of water. So see eight H. 16 oh is a non electrolyte. So it's I equals one. Its molar mass Is 128 .208 g per mole. It has the highest molar mass and the lowest moles of particle. So it has the highest VP four C. We have 50.0 g of one hep to gnaw and 200. mL of water. C seven H 16 Is a non electrolyte, so I equals one. Its molar mass Is 116. grams. For mold. It has a mid molar mass And I equals one so lowest moles a particle, and that makes it the middle VP. So our answer here is going to be a NAC 003. Thank you for watching. Bye.

Ch.14 - Solutions

All textbooks

Tro 5th Edition

Ch.14 - Solutions

Problem 70

Chapter 14, Problem 70

Which solution has the highest vapor pressure? a. 20.0 g of glucose (C₆H₁₂O₆) in 100.0 mL of water b. 20.0 g of sucrose (C₁₂H₂₂O₁₁) in 100.0 mL of water c. 10.0 g of potassium acetate KC₂H₃O₂ in 100.0 mL of water

Verified step by step guidance

Identify the molecular weights of glucose (C6H12O6), sucrose (C12H22O11), and potassium acetate (KC2H3O2).

Calculate the number of moles of each solute using the formula: number of moles = mass of solute (g) / molecular weight of solute (g/mol).

Understand that according to Raoult's Law, the vapor pressure of a solution is directly proportional to the mole fraction of the solvent. Therefore, the more solute particles present, the lower the vapor pressure of the solution.

Compare the number of moles calculated for each solution to determine which has the fewest moles of solute. This solution will have the highest mole fraction of water and thus the highest vapor pressure.

Conclude that the solution with the highest vapor pressure is the one with the fewest moles of solute, as it will have the least impact on lowering the vapor pressure of the water.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.

Video duration:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Vapor Pressure

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature. It reflects the tendency of particles to escape from the liquid phase into the vapor phase. Solutions with lower concentrations of solute typically have higher vapor pressures because fewer solute particles disrupt the escape of solvent molecules.

Colligative Properties

Colligative properties are properties of solutions that depend on the number of solute particles in a given amount of solvent, rather than the identity of the solute. These properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure. The more solute particles present, the greater the effect on the vapor pressure, leading to a lower vapor pressure for more concentrated solutions.

Molar Mass and Particle Count

The molar mass of a solute determines how many moles are present in a given mass of solute. For example, glucose (C6H12O6) has a lower molar mass than sucrose (C12H22O11), meaning that for the same mass, glucose will produce more moles of solute particles in solution. This difference in particle count affects the colligative properties, including vapor pressure, as more particles lead to a greater lowering of vapor pressure.

Recommended video:

Guided course

02:11

Molar Mass Concept

Related Practice

Textbook Question

One brand of laundry bleach is an aqueous solution containing 4.55% sodium hypochlorite (NaOCl) by mass. What is the molarity of this solution? (Assume a density of 1.02 g/mL.)

Textbook Question

An aqueous solution contains 36% HCl by mass. Calculate the molality and mole fraction of the solution.

Textbook Question

Calculate the vapor pressure of a solution containing 24.5 g of glycerin (C₃H₈O₃) in 135 mL of water at 30.0 °C. The vapor pressure of pure water at this temperature is 31.8 torr. Assume that glycerin is not volatile and dissolves molecularly (i.e., it is not ionic), and use a density of 1.00 g/mL for the water.

Textbook Question

A solution contains 50.0 g of heptane (C₇H₁₆) and 50.0 g of octane (C₈H₁₈) at 25 °C. The vapor pressures of pure heptane and pure octane at 25 °C are 45.8 torr and 10.9 torr, respectively. Assuming ideal behavior, answer the following: d. Why is the composition of the vapor different from the composition of the solution?

Textbook Question

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 258 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction composition of the mixture? (Assume ideal behavior.)

Which solution has the highest vapor pressure? a. 20.0 g of glucose (C6H12O6) in 100.0 mL of water b. 20.0 g of sucrose (C12H22O11) in 100.0 mL of water c. 10.0 g of potassium acetate KC2H3O2 in 100.0 mL of water

Verified video answer for a similar problem:

Key Concepts

Vapor Pressure

Colligative Properties

Molar Mass and Particle Count

Which solution has the highest vapor pressure? a. 20.0 g of glucose (C₆H₁₂O₆) in 100.0 mL of water b. 20.0 g of sucrose (C₁₂H₂₂O₁₁) in 100.0 mL of water c. 10.0 g of potassium acetate KC₂H₃O₂ in 100.0 mL of water