Molecular mass of volatile liquid?

Question

what mass of carbon tetrachloride, CCl4, must be vaporized at 100.0 C to fill a flask with a volume of 275.0mL when the atmospheric pressure is 753.9 torr?

Answer 1

Ideal gas law

PV = nRT

where

P = pressure = 753.9 torr = 100500 Pascal

V= volume = 275.0mL = 0.0002750 m^3

n = number of moles

R = ideal gas constant = 8.3145 J·mol-1·K-1

T = absolute temperature = 100.C = 373K

Rearrange the equation to calculate the number of moles:

n = PV/RT

= (100500Pascal)(0.0002750m^3)/(8.314J·mol...

= 0.008912 moles

molar mass of CCl4 = 141.81g/mol

mass = molar mass x number of moles

= 141.81g/mol x 0.008912moles = 1.264grams

Hope that was helpful enough =)