Which was the limiting reactant: the zinc or the hydrochloric acid? remember that the limiting reactant is completely consumed in a reaction and no new product is formed unless more of the limiting reactant is added.

Suppose you initially have equal amounts of the reactants: 1 g of zinc (65.38 g/mol) and 1 g of HCl (36.46 g/mol). The reaction would be:

Zn + 2 HCl → ZnCl₂ + H₂

Moles Zn: 1/65.38 = 0.0153 mol
Moles HCl: 1/36.46 = 0.0274 mol

Moles of HCl needed:
0.0153 mol Zn (2 mol HCl/1 mol Zn) = 0.0306 moles HCl needed

Since the available moles of HCl is lesser than the theoretical amount of HCl needed, then the limiting reactant is HCl in this reaction.

It would be (at) + cu (s)

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