[4evrastudent]

Hello ChemicalForums!

I would like help with a vapor pressure problem. I am given the vapor pressure of pure carbon tetrachloride at 65^oC as 504 torr. I am asked to find how many grams C₁₀H₈ need sto be dissolved in 25.0g of CCl₄ to get the vapor pressure pf CCl₄ to be 483 torr over the solution. I am also told to assume C₁₀H₈ is nonvolatile at this temperature.

My work thus far:
P_a = X_a * P^o_A
483 torr = X_a * 504 torr CCl₄
25.0g * \frac mol {153.82 g} = .1625 mol
483 torr = \frac .1625 {.1625 + x} * 504 torr

Sorry for my lack of experience with formatting. If someone could point me in the right direction, or tell me if I've gone completely wrong, that would be appreciated. Thanks!

[Borek]

If I am reading your calculations OK, you are on the right track.

(Please remember to use [tеx][/tеx] tags around your LaTeX formulae).