A gas sample containing only SO3, CH2O and C2H6O2 has the following mass percent composition: 65.1% SO3 and 8.79% CH2O. Calculate the partial pressure (torr) of SO3 if the total pressure of the sample is 4712 torr.

Question

A gas sample containing only SO3, CH2O and C2H6O2 has the following mass percent composition: 65.1% SO3 and 8.79% CH2O. Calculate the partial pressure (torr) of SO3 if the total pressure of the sample is 4712 torr.
	
Unit conversion
K = C + 273
1 atm = 760 torr

Molar Mass (g/mol)
SO3 	80.063
CH2O 	30.026
C2H6O2 	62.068

DrBob222 · Answer

I would convert the percent composition of the gas to mole fractions, then P_SO₃ = X_SO₃*P_total

Luc · Answer

I came up with 3461 torr, but the homework program I am using said that the correct answer is 2510 torr. So, I either did something wrong, or the method provided above does not work