Thermochemistry and Energy Problem!?

Question

I am so lost on this problem. You don't have to solve it but it would be awesome if you would help me figure it out or at least point me in the right direction. I have no idea how to approach this. I need help. Thanks so much to anyone who attempts this!

Using heats of formation and the priciples of thermochemistry, it can be determined that the combustion reaction for one mole of methane (natural gas)...

CH4 (g) + 2 O2 (g) ---> CO2 (g) + 2 H2O (g)

Heat of Formation= -213 kcals

The amount of energy released by the fission of one mole of U-235 is calculated as follows...

6.02 x 10^23 atoms/ mole U-235 x 1 fission/ atom x (7.17x 10 ^/12 cal)/fission x 1 kcal/1000 cal

= 4.3 x 10^9 kcal/mol

How many times more energy do we get from a mole of U-235 than from a mole of CH4? Explain.

Answer 1

All the data has been provided, so you simply divide 4.3 x 10^9 kcal/mol by 213 kcal/mol giving

2.0188 x 10^7, which rounds to 20 million.