Answer to Question #82913 in General Chemistry for Joco

Question

Solve using hess law

1. Desired equation
S(s)+ O2 (g) yields SO2 (g)

Using
2S(s) + 3O2 (g) yields 2SO3(g) delta H equals -790.4kJ
2SO2(g) + O2(g) yields 2SO3. delta H equals -198.2 kJ


2. Desired equation
NO2(g) yields NO(g) + 1/2 O2 (g)

Using
N2 (g) + O2 (g) yields 2NO(g) delta H equals 180.5 kJ
N2 (g) + 2O2 (g) yields 2 NO2(g) delta H equals 66.36 kJ