Liquid benzene $(C_6H_6)$ bums in oxygen according to the equation,
$ \, \, \, \, \, \, 2C_6H_6 (I) + 15O_2 (g) \rightarrow 12 CO_2 (g) + 6H_2O(g) $
How many litres of $O_2$ at STP are needed to complete the combustion of 39 g of liquid benzene?
$(Mol. \, weight \, of \, O_2 = 32, C_6H_6 = 75)$