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12 May, 17:26

2C (s) + 2H2 (g) → C2H4 (g) : ΔH = + 52.4 kJ/mol

Which statement about this reaction is correct?

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  1. 12 May, 18:24
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    Answer;

    26.2 kJ of energy are absorbed for every mole of carbon reacted

    Explanation; ΔH is the enthalpy change which is given by subtracting the energy of reactants from the energy of products. That is; ΔH = energy of products - energy of reactants In this case, it means that C2H4 has more energy than the the reactants. 52.4 J of energy to be precise, this energy is absorbed during the reaction. However, Two moles of Carbon require that much energy, thus one mole will require only 26.2 to react.
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