Hey I need help with 84-88

What is the number of moles in 15.0 g ash3?

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

In which situation can a mixture always be called a solution