Benzene

IUPAC Nomenclature Of Functional Group Containing Compounds|Meaning Of Functional Group|Rules|Questions|Nomenclature Of Substituted Benzene Compounds|Nomenclature Of Monosubstituted Benzene|Nomenclature Of Disubstituted Benzene|Nomenclature Of Polysubstituted Benzene|When Functional Group Is Attached To Benzene|OMR

Benzen is purified by

At 20^@ C, the vapour pressure of benzene is 70 torr and that of methyl benzene is 20 torr. The mole fraction of benzene in the vapour phase at 20^@ C above an equimolar mixture of benzene and methyl benzene is ________ xx 10^(-2) . (Nearest integer)