Al = 0.5 mol, S = 0.5 mol. Sulphur is limiting. Al₂S₃ formed = 0.5/3 = 0.1667 mol. Mass = 0.1667 × 150 = 25 g.
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27. In the reaction 4Al + 3O₂ → 2Al₂O₃, a chemist mixes 5 moles of Al with 4 moles of O₂. The limiting reactant is
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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)
