Stoichiometry Questions Help

Question

If 1.21 moles of solid zinc are added to 96.85 g of hydrochloric acid, then zinc chloride and hydrogen

gas is produced.

a. Write a balanced chemical equation for this reaction.

b. Determine which reactant is the limiting reagent.

c. What mass of zinc chloride can be produced from this reaction

Answer 1

a). Zn(s) + 2HCl(aq) == ZnCl₂(aq) + H₂(g)

b). 1.21 moles Zn x 1 mol ZnCl₂/mol Zn = 1.21 mole ZnCl2 produce

96.85 g HCl x 1 mol HCl/36.5 g x 1 mol ZnCl2/2 mol HCl = 1.33 mole ZnCl2 produced

Limiting reactant is Zn

c). mass ZnCl₂ = 1.21 moles ZnCl₂ x 136 g ZnCl₂/mol ZnCl₂ = 165 g ZnCl₂