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# Consider the following data. Mg(s) + S(s) MgS(s) H = -598.0 kJ SO2(g) S(s) + O2(g)...

Consider the following data.

Mg(s) + S(s) MgS(s) H = -598.0 kJ

SO2(g) S(s) + O2(g) H = +296.8 kJ

MgS(s) + 2 MgO(s) 3 Mg(s) + SO2(g) H = +1504.6 kJ

Use Hess's law to calculate H for the reaction below.

2 Mg(s) + O2(g) 2 MgO(s)

Lets number the reaction as 1, 2, 3, 4 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 4 = -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 * (-598.0) -1 * (296.8) -1 * (1504.6)
= -1203.4 KJ

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