Answered: solution in a sealed flask contains 15…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

solution in a sealed flask contains 15 g of sodium chloride in 150 mL water. Given the vapor pressure of pure water to be 23.8 torr, calculate the vapor pressure of the solution.

		7.58
		136.5
		23.0
		0.0328
		0.257

Expert Solution

Step 1

Given mass of sodium chloride = 15 g

Molar mass of sodium chloride = 58.5 g/mol

Number of moles of sodium chloride = 15/58.5 = 0.256 mol

Volume of water = 150 ml = 0.15 L

Density of water = 1 g/ml

Mass of water = 150 g

Molar mass of water = 18 g/mol

Number of moles of water = 150/18 = 8.33 mol

Total number of moles = 8.33 + 0.256 = 8.586

Mole fraction of sodium chloride (solute) is equal to the ratio of number of moles of sodium chloride to the sum of number of moles of solute and solvent. The mole fraction of sodium chloride is equal to 0.256/8.586 = 0.0298

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