LPG is a mixture of
C6H12+C6H6
C4H10+C3H8
C2H4+C2H2
C2H4+CH4
LPG is a mix oif ethane, propane & butane. The main component is butane.
The rate of effusion of LPG (a mixture of n-butane and propane) is 1.25 times that of SO3. Hence, mass fraction of n-butane in LPG is :