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12 May, 19:26

Rolls

Which reaction shows that the enthalpy of formation of C2H4 IS A Hp = 52.5

kJ/mol?

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Answers (1)
  1. 12 May, 19:58
    0
    A. 2C (s) + 2H₂ (g) + 52.5 kJ → C₂H₄ shows that the enthalpy of formation of C₂H₄ is 52.5 kJ/mol.

    Step-by-step explanation:

    Enthalpy of formation of C₂H₄ is given as 52.5 kJ/mol.

    There are 4 options given and they are:

    A. 2C (s) + 2H₂ (g) + 52.5 kJ → C₂H₄

    B. 2C (s) + 4H (g) + 52.5 kJ → C₂H₄

    C. 2C (s) + 2H₂ (g) → C₂H₄ + 52.5 kJ

    D. 2C (s) + 4H (g) → C₂H₄ + 52.5 kJ

    Here the reactants absorb some energy from the surroundings and gives the product and it is an endothermic reaction.

    So A and B is taken into account, but in B there are 4 H atoms involved in the reaction. So in the reaction A hydrogen molecules are involved and also energy is absorbed by the reactants.

    So option A is the answer.
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