Dentify the part of the water cycle when ocean water may end up in a river. a river

Options:
Condensation
Precipitation
Collection
Evaporation

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

That is a lot of moles that you have