The mass percent of a three component gas sample is 95.2% PF5, 1.40% C2H2 and 3.40% C3H6. Calculate the partial pressure (atm) of PF5 if the total pressure of the sample is 570.0 torr.

Answer 1

I would approach this problem by assuming a convenient sample of the gas (say 100 g), convert each to grams, then to moles, then determine the mole fraction of PF5.
Use Raoult's Law to finish.
P = XP^{o
By the way, it helps us if you DON'T use different names for posting various questions.}

Answer 2

CALCULATE THE NUMBER OF MOLES FOR 12.7 MG OF IRON SULFATE