Converting Energy Density?

Question

How do you convert the energy density of petrol from -5508 KJ/Mole to 3300 KJ/L?

Im getting really hooked up on the maths behind it.

Answer 1

Multiply with molar volume v=rho/M. M: molar weight; rho density in g/l. For petrol it here should be a good value in a book.

So +- 5508 KJ/mol*v = +- 3300 KJ/L // either both values are positive or negative!!

From given data: v=0.599 mol/l