Question

Density of a gas was found to be 5.5 g/L at 2 bar pressure and at 250C. Calculate its molar mass. (R=0.083 L bar/K/mol)​

Answer 1

$pv = nrt \\ p = \frac{m}{molecular \: mass \times v} rt \\ molecular \: mass = \frac{m}{pv} rt \\ \\ molecular \: mass = \frac{d}{p} rt$
where d= density
p= pressure, r= universal gas constant, t= temperature
molecular mass= 5.5*0.083*523/2
molecular mass= 119.3gm