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11 August, 11:23

If you need to reverse the following reaction in order for it to be an intermediate reaction in a Hess's law problem, what would be the final value for the enthalpy of reaction you use for this intermediate reaction? H2 + 0.5 O2 H2O, H = - 286 kJ

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  1. 11 August, 11:35
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    When reversing a given reaction, we simply change the sign of the standard enthalpy change value. Therefore, the reaction will become:

    H₂O → H₂ + 0.5O₂, ΔH = 286kJ

    This is because if a certain amount of energy is released when a reaction occurs, the same amount of energy must be supplied for the reaction to occur in the reverse direction.
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