Which term is best defined as a measure of the amount of space a substance occupies?

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

In which reaction is precipitation occurring?