One mole X requires 3 mol Y. Only 2 mol Y are available.
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66. In the reaction 4P + 5O₂ → 2P₂O₅, a chemist combines 62 g of phosphorus and 64 g of oxygen. The number of moles of P₂O₅ formed is
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68. In the reaction 2SO₂ + O₂ → 2SO₃, 128 g of SO₂ and 64 g of O₂ are used. The mass of SO₃ produced is