2c(s) + 2h2(g) → c2h4(g): δh = +52.4 kj/mol
which statement about this reaction is correct?

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 reactantsIn 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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