Answer to Question #158520 in General Chemistry for Sage Topaz

Question

What is the molecular mass (Formula mass) if a 3.2 g of the gas occupies a volume of 1.6 L at 30 degree Celsius and 745 Millimeter mercury?

Answer 1

$P1V1/T1=P0V0/T0$

745 mm Hg = 99.325 kPa

$V0=P1V1T0/(T1*P0)$

$V0=99.325*1.6*273/(303*101.325)=1.4 L$

$V/Vm=m/M$

$M=3.2*22.4/1.4=51.2 g/mol$