Question

For the gaseous compound C3H8, calculate the partial pressure of C3H8 in a gaseous mixture of equal masses of C3H8 and CH4 at 750 mmHg.

I'm trying to use the formula P(A) = X(mole fraction) x P(total), but I can't seem to find the moles of each compound. I don't know how to effectively solve this. Any help is appreciated. Thanks

Answer 1

The easiest way to do this is to simply make up a number for the mass of each. It says equal masses so take 20 grams, or whatever is a convenient number for you. and use that for both. You can go from there to mols and from mols to fraction and from therer to p = X*Ptotal

Answer 2

That makes a lot of sense. Thank you