Could someone explain Nuclear Fission and Nuclear Fusion, and how it works?

nuclear fusion joins atomic nuclei together, the elements formed has more neutrons and proton than that of the starting materials while nuclear fission is splitting of atoms

Thus both are nuclear process by which atoms are altered to create energy but fission is division of one atom or two and fusion is the combination of two lighter atoms

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.