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2 June, 23:25

Consider the reaction: 2 NO (g) + 5 H2 (g) → 2 NH3 (g) + 2 H2O (g) A reaction mixture initially contains 5 moles of NO and 10 moles of H2. Which set of amounts best represents the mixture after the reactants have reacted as completely as possible?

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  1. 2 June, 23:41
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    2 NO (g) + 5 H2 (g) → 2 NH3 (g) + 2 H2O (g)

    From the reaction above, 2 moles of NO requires 5 moles of H2 to obtain 2 moles of NH3 and 2 moles of H2O

    If all the 5 moles of NO was used, it would require;

    2 moles of NO = 5 moles of H2

    5 moles of NO = x

    x = 12.5 moles of H2

    However there is only 10 moles of H2. This makes it the limiting reactant.

    When the 10 moles of H2 are used;

    5 moles of H2 = 2 moles of NO

    10 moles of H2 = x

    x = 4 moles of NO

    This means 4 moles of NO and 10 moles of H2 are used.

    Only 1 mole of NO would remain.
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