Respuesta :

Answer:

- 65 kJ

Explanation:

Hess's Law of Constant Heat Summation (or just Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes

A+2B   +   B + 2C   ===>   C +D   + 2C+ D

   -20kJ      -45 kJ  ===>   3C + 2D

-65 kJ

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