blend100
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When working out the enthalpy of combustion of hydrogen.
2H2+02 ----->2H2O
Why do you divide by 2 at the end to get the final enthalpy change?
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Reversed Flash
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Enthalpy of combustion is defined as the Enthalpy change observed in a constituent thermodynamic system when 1 mole of a substance reacts completely with oxygen under standard conditions.

The "one mole" is the key point here you need to do everything in terms of that.
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