We have to calculate the mole fraction of ethanol in the vapor above solution.
The mole fraction of a component in the vapors above the solution is calculated using this formula:
Xa = mole fraction of a component in vapors above solution
Pa = vapor pressure of a component of solution
Pt = total vapor pressure
At 63.5oC the vapor pressure of H2O is 175 torr, and that of ethanol (C2H5OH) is 400 torr. A solution is made by mixing equal masses of H2O and C2H5OH.
What is the mole fraction of ethanol in the vapor above the solution?
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Partial Pressure concept. You can view video lessons to learn Partial Pressure. Or if you need more Partial Pressure practice, you can also practice Partial Pressure practice problems.