Question

The density of agas is found to be 1.56g/lit at 745mm pressure and 65c temp.The molecular mass is

Answer 1

Pressure is p=745mm=0.98atm (1atm=760 mm Hg)

Temperature is T=65°C=65+273=338K

density is d=1.56g/L

P=dRT/M where M is molecular wt.

⟹M=dRT/P

⟹M=1.56×338×0.0821/0.98=44.2u

Hence, the molecular mass of the gas is 44.2u.