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14 September, 06:13

When the amount of energy required to break bonds in the reactants is less than the amount of energy released in forming bonds in the products, the process has a negative change in enthalpy (-ΔH). True False

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  1. 14 September, 09:34
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    the enthalpy of a reaction is calculated from the following formula

    ΔHrxn = ∑ΔHf (products) - ∑ΔHf (reactants)

    Now its clear from the formula that if

    a) the enthalpy of products will be more than the reaction enthalpy will be positive [endothermic reaction]

    b) the enthalpy of products will be less than the reaction enthalpy will be negative [exothermic reaction]

    Also

    ΔHrxn = ∑Bond energies of reactants - ∑Bond energies of products

    So

    if bond energy of reactants [the energy required to break bond] is less than the bond energy of products the enthalpy of reaction will be negative.
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