Chemistry / Chem 0682 · Atom · ~20 seconds
Scaling Enthalpy Change with a Thermochemical Equation's Coefficients
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A thermochemical equation reports ΔH beside a balanced equation, and multiplying every coefficient by a factor multiplies ΔH by that factor too.
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If forming one mole of water releases 286 kJ, forming two moles by doubling every coefficient releases 572 kJ.
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Misreading a doubled reaction's unchanged lab temperature as proof the released heat did not scale confuses ΔH with a measured value.