How many molecules of benzene (C6H6) are there in 1 L of benzene? Specific gravity of benzene is 0.88 g/ml . Express your answer in terms of 1024 molecules to the nearestpossible integer.

Mw of benzene C6H6=12×6+1×6=78g1 litre of benzene =1000mL Mass of 1000mL of benzene = volume × density =1000×0.88=880g∴78g of benzene =6.023×1023 molecules 880g of benzene =6.023×1023×88078=6.795×1024 molecules. ⇒7