At what temperature does a chemical turn into a gas

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

What is the work done by the electric force to move a 1 c charge from a to b?