MULTIPLE CHOICE CHEM QUESTIONS

can someone please help:)

i’ll give a brainist:)

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o

Which process results in the release of energy stored in the products of photosynthesis? a. polymer synthesis b. depolymerization c. digestion d. cellular respiration

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released