Problem: A scientist measures the standard enthalpy change for the following reaction to be -582.2 kJ : H2CO(g) + O2(g) → CO2(g) + H2O(l) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO2(g) in kJ/mol.

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We’re being asked to determine the enthalpy of formation (ΔH˚f) for CO2(g):

H2CO(g) + O2(g) → CO2(g) + H2O(l) ΔH˚rxn =  -582.2 kJ


Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:

ΔH°rxn=ΔH°f, prod-ΔH°f, react


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Problem Details

A scientist measures the standard enthalpy change for the following reaction to be -582.2 kJ : H2CO(g) + O2(g) → CO2(g) + H2O(l) 

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO2(g) in kJ/mol.

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