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given the following data:

S(s)+3/2 O2(g)->SO3(g) H=-395.2 kj
2SO2(g)+ O2(g)->2SO3(g) H=-198.2kj

calculate H for the reaction
S(s)+ O2(g)->SO2(g)

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Use equation 1 as written.
Take 1/2 equation 2 and reverse it, then add to #1. Add dH for 1 to 1/2 of -dH for 2.

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