Use Raoult's Law where:
Mole fraction of B can be simplified as:
XB = 1 - XA
What is the composition of a methanol (CH3OH)–propanol (CH3CH2CH2OH) solution that has a vapor pressure of 174 torr at 40°C? At 40°C, the vapor pressures of pure methanol and pure propanol are 303 and 44.6 torr, respectively. Assume the solution is ideal.
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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.