The limiting reactant determines the maximum amount of product that can be formed.
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29. In the reaction Zn + 2HCl → ZnCl₂ + H₂, 6.5 g of zinc and 7.3 g of HCl are reacted. The volume of H₂ at STP produced is (Zn = 65, Cl = 35.5, H = 1)
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31. For the reaction 3Fe + 4H₂O → Fe₃O₄ + 4H₂, 112 g of Fe and 36 g of H₂O are reacted. The mass of Fe₃O₄ produced is (Fe = 56, O = 16)