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**Solution**: Given the following informationA + B → 2D ΔH° = 724.9 kJ ΔS° = 307.0 J/KC → D ΔH° = 402.0 kJ ΔS° = -139.0 J/KCalculate ΔG° for the following reaction at 298 K.A + B → 2C

###### Problem

Given the following information

A + B → 2D ΔH° = 724.9 kJ ΔS° = 307.0 J/K

C → D ΔH° = 402.0 kJ ΔS° = -139.0 J/K

Calculate ΔG° for the following reaction at 298 K.

A + B → 2C

###### Solution

• Use **Hess's Law** to find the the ΔH° and ΔS° of the third reaction from the first two reactions

• *Manipulate *the two reactions such that when you add them they will* produce *the third reaction

• *Changes *made to the reaction should also be *applied to ΔH° and ΔS° *

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