chemistry
posted by rame .
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)

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.