The vapour pressure of 2-propanol, C3 H8 O, is 50.00 kPa at 338.8°C, but it fell to 49.62 kPa when 8.69 g of an involatile organic compound was dissolved in 250 g of 2-propanol. Assuming that 2-propanol is ideal and it obeys Raoult’s Law, calculate the molar mass of the compound in gram per mole. (molar mass: C = 12 g/mol; O = 16 g/mol; H = 1 g/mol)  Choices  a = 670 b = 272 c = 544 d = 98 e = 160

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter12: Solutions
Section: Chapter Questions
Problem 12.84QE
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The vapour pressure of 2-propanol, C3 H8 O, is 50.00 kPa at 338.8°C, but it fell to 49.62 kPa when 8.69 g of an involatile organic compound was dissolved in 250 g of 2-propanol. Assuming that 2-propanol is ideal and it obeys Raoult’s Law, calculate the molar mass of the compound in gram per mole. (molar mass: C = 12 g/mol; O = 16 g/mol; H = 1 g/mol) 

Choices 

a = 670
b = 272
c = 544
d = 98
e = 160
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