Acetone (mw = 58.08, P25 C=232 mmHg) and butanone (mw = 72.11, P 25 C=100 mmHg) have the indicated molar masses and vapor pressures. A container holds 1.00 kg of butanone. How much acetone must be added to the butanone to elevate the total vapor pressure over the mixture to 125 mmHg at 25°C?

Question

Acetone (mw = 58.08, P25 C=232 mmHg) and butanone (mw = 72.11, P 25 C=100 mmHg) have the indicated molar masses and vapor pressures.  A container holds 1.00 kg of butanone.  How much acetone must be added to the butanone to elevate the total vapor pressure over the mixture to 125 mmHg at 25°C?

Quizplus · Accepted Answer

To find the amount of acetone needed, use Raoult's Law for the total vapor pressure of the mixture. Calculate the moles of butanone, then use the desired total pressure to find the moles of acetone required.

Acetone (Mw = 58