## Answers

6)

Lets number the reaction as 0, 1, 2, 3 from top to bottom

required reaction should be written in terms of other reaction

This is Hess Law

required reaction can be written as:

reaction 0 = +1 * (reaction 1) +1 * (reaction 2) +1 * (reaction 3)

So, ΔHo rxn for required reaction will be:

ΔHo rxn = +1 * ΔHo rxn(reaction 1) +1 * ΔHo rxn(reaction 2) +1 * ΔHo rxn(reaction 3)

= +1 * (-202.0) +1 * (567.0) +1 * (22.6)

= 387.6 KJ

Answer: 387.6 KJ

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