Use the molar heat of reaction, which you will need to look up (or calculate from Heats of formation) , to get the number of moles of C6H6 required. Then convert that to volume using the density and molar mass provided.
This reference has a heat of combustion for C6H6:
http://en.wikipedia.org/wiki/Heat_of_combustion
what volume of benzene ( C6H6 d=0.88g/ml molar mass = 78.11) is required to produce 1.5*10^3 kj of heat
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