Chemistry / Unit 4 Chem 0682 short lesson, about 20 seconds
Scaling Enthalpy Change with a Thermochemical Equation's Coefficients
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The idea
A thermochemical equation reports ΔH beside a balanced equation, and multiplying every coefficient by a factor multiplies ΔH by that factor too.
In practice
If forming one mole of water releases 286 kJ, forming two moles by doubling every coefficient releases 572 kJ.
Where people slip
Misreading a doubled reaction's unchanged lab temperature as proof the released heat did not scale confuses ΔH with a measured value.
Your place on the trail
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