The heating value of a Gas is 39MJm-3

Question

a) If 4.5m-3 of the gas is burned how much energy is released?

b) If the gas is burned in 5 minutes what is the power?

c) If the burning occurs in an engine that converts the energy to forward
motion and the engine is 20% efficient in converting the heat energy: what is
the kinetic energy a vehicle would have after burning the above quantity of
gas? – (assume no losses due to friction or air resistance)

Answer 1

a) Do you mean 4.5 m-3 or
4.5*10^-3 m^3 ?

The number you wrote is not a volume

Answer 2

I'm not sure, it says 4.5 m^-3

Answer 3

4.5/m^3 just is not volume. Assume it meant 4.5m³.

Then energy= heatvalue*volume=39MJ/m^3*4.5m^3=you do it.