Consider the following data.
Mg(s) + S(s) <— —> MgS(s). TriangleH=-598.0 kJ
SO2(g) <— —> S(s) + O2(g) TriangleH= +296.8 kJ
3 Mg(s) + SO2(g) <— —> MgS(s) + 2 MgO(s) TriangleH = -1504.6 kJ
Use Hess’s law to calculate TriangleH for the reaction below.
2 Mg(s) + O2(g) <— —> 2 MgO(s)
1) TriangleH = ____ kJ
-598+296.8--1504.6
= 1203.4kJ
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