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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Chemistry

Cynthia Day

3 March, 14:28

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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Aarav Marsh · Answer 1

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.