4.1 PRACTICE ** Exercise 14.40 Consider the following hypothetical reactions: A → B AH = + 30 kJ с → B ΔΗ =- 60 kJ (a) U
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4.1 PRACTICE ** Exercise 14.40 Consider the following hypothetical reactions: A → B AH = + 30 kJ с → B ΔΗ =- 60 kJ (a) Use Hess's Law to calculate the enthalpy change for the reaction AC. (b) Construct an enthalpy diagram for substances A, B and C, and show how Hess's Law applies.