[premedman]

Q1:
A. Pure Octane has a boiling point of 125.7 degrees Celsius, but can be steam distilled with water at a temperature of 90 degrees Celsius. Calculate the mass of octane that codistills with each gram of water and the percent composition of the vapor that is produced during the steam distillation.

B. One synthetic preparation of aniline involves reducing nitrobenzene with iron and HCL, and then steam distilling the resultant aniline at 99C. How much aniline codistills with each gram of water during steam distillation?

For A), I do not even know where to start.

For B) However.

I do not know how to get the molecular weight for the aniline in this problem.
I know that
mass oil/mass water = (Poil)(MW oil) + (Pwater)(MW water) and that the Vapor pressure of water at 99 °C = 733 mmHG, so all I'm really missing is the Molecular weight but how can i solve it??

[fledarmus]

For B - aniline is a specific organic molecule - if you do not know it's structure, you can look it up on wiki and find the molecular weight.

[premedman]

And for A?

[fledarmus]

For A, what do you know about the partial pressures of octane and water at the temperature you are doing your distillation at? What does this tell you about the composition of the vapor?