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Question (1 point) Calculate the enthalpy of formation of 1 mole SO2(g) from the standard enthalpy changes of the following r
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Answer #1

Lets number the reaction as 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 3 = +0.5 * (reaction 1) +0.5 * (reaction 2)

So, ΔHo rxn for required reaction will be:

ΔHo rxn = +0.5 * ΔHo rxn(reaction 1) +0.5 * ΔHo rxn(reaction 2)

= +0.5 * (196) +0.5 * (-790)

= -297 KJ

Answer: -297 KJ

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