Zinc reacts with dilute hydrochloric acid according to the equation:
Zn (s) + 2HCl (aq) -> ZnCl2 (aq) + H2 (g)
If 0.05 mole of zinc was added to 0.075 mole of hydrochloric acid,
(a) identify the limiting reactant;
(b) calculate the amount (in moles) of the excess reactant which remained unreacted;
(b) calculate the amount (in moles) of zinc chloride formed.