The nuclear reaction that powers the sun is the fusion of four protons into a helium nucleus. The process involves several steps, but the net reaction is simply 4p→4He+energy. The mass of a helium nucleus is known to be 6.64×10−27kg.

Part A

How much energy is released in each fusion?

Express your answer to one significant figure and include the appropriate units.

Part B

What fraction of the initial rest mass energy is this energy?

Express your answer using one significant figure.

Show the steps, thanks.