2s(s) + 3 o2(g) → 2 so3(g) δh°rxn = ? given: so2(g) → s(s) + o2(g) δh°rxn = +296.8 kj 2 so2(g) + o2(g) → 2 so3(g) δh°rxn = -197.8 kj use the standard reaction enthalpies given below to determine δh°rxn for the following reaction: 2 s(s) + 3 o2(g) → 2 so3(g) δh°rxn = ? given: so2(g) → s(s) + o2(g) δh°rxn = +296.8 kj 2 so2(g) + o2(g) → 2 so3(g) δh°rxn = -197.8 kj -293.0 kj -692.4 kj -494.6 kj 1583 kj -791.4 kj