An aqueous CaCl2 solution has a vapor pressure of 82.3 mmHg at 50 degrees C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent?
mass %=(mass of component/total mass)*100%
The Attempt at a Solution
I know I have to use Raoult's Law in order to compute the mole fraction but I'm not sure what to do after. Once I have mole fraction what do I do?