13.57 g of hydrate magnesium sulfate is heated leaving behind a residue of 6.63 g. What are the name and formula of this hydrated salt ?

the answer is definitely c.

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.

the enthalpy change that occurs in a system when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states.