Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20°C for a solution containing 78g of benzene and 46 g of toluene in torr is (a) 50 (b) 25 (c) 37.5 (d) 53.5

The structure of methylbenzene (toluene) Methylbenzene has a methyl group attached to the benzene ring replacing one of the hydrogen atoms. Attached groups are often drawn at the top of the ring, but you may occasionally find them drawn in other places with the ring rotated.