Suppose you want to calculate the percentage hydrogen and oxygen in
water (H20). What do you need to
calculate first?
Determine the percent composition of
each of the elements in Iron(III) Chloride,
FeCl3

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.