Problem: How would you calculate the standard enthalpy change for the reaction 2A + B → 2C + 2D, if A = -269 kJ/mol, B = -411 kJ/mol, C = 189 kJ/mol, D = -481 kJ/mol?

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We’re being asked to calculate the standard enthalpy change for the reaction:

2A + B → 2C + 2D


We can use the following equation to solve for ΔH˚rxn:


ΔH°rxn=ΔH°f, prod-ΔH°f, react

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Problem Details

How would you calculate the standard enthalpy change for the reaction 2A + B → 2C + 2D, if A = -269 kJ/mol, B = -411 kJ/mol, C = 189 kJ/mol, D = -481 kJ/mol?

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Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.