When Kay added 30 g of hydrochloric acid (HCl) to 65 g of Zn bubbles appeared and a white precipitate zinc chloride (ZnCl2) was produced. She found that the mass of the zinc chloride was 63 g. Since t?

It appears that a chemical reaction took place between hydrochloric acid and zinc producing zinc chloride and hydrogen gas. The balanced chemical equation for this reaction is: 2HCl + Zn → ZnCl2 + H2. The mass of the zinc chloride formed (63g) is less than the total mass of the reactants that were used (95g), this is likely due to the escape of some hydrogen gas during the reaction.