5 mol Al requires 3.75 mol O₂. Since 4 mol O₂ are available, oxygen is in excess. Aluminium is limiting.
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26. In the Haber process, N₂ + 3H₂ → 2NH₃, a mixture of 56 g of N₂ and 12 g of H₂ is used. The maximum mass of ammonia formed is (N = 14, H = 1)
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28. During the reaction of 13.5 g of aluminium with 16 g of sulphur (2Al + 3S → Al₂S₃), the mass of aluminium sulphide formed is (Al = 27, S = 32)
