Answer:
Nuclear Fission is a nuclear reaction or a Radioactive decay progress in which the necleus of an atom splits into two or more smaller, lighter neclei
Because if they are submerged in the solvent, they would dissolve! This would prevent them from seperating and not allow you to actually record anything
I don't know how 5°C cooled to 85°C but the answer would be 12.878L
They have different neutron number and thus different mass number, but they are the same element.