Part A
Calculate the enthalpy of the reaction
2NO(g)+O2(g)→2NO2(g)
given the following reactions and enthalpies of formation:
12N2(g)+O2(g)→NO2(g), ΔfH∘A=33.2
kJ mol−1
12N2(g)+12O2(g)→NO(g), ΔfH∘B=90.2
kJ mol−1
Express your answer with the appropriate units.
Part B
Calculate the enthalpy of the reaction
4B(s)+3O2(g)→2B2O3(s)
given the following pertinent information:
B2O3(s)+3H2O(g)→3O2(g)+B2H6(g), ΔrH∘A=+2035 kJ
mol−1
2B(s)+3H2(g)→B2H6(g), ΔrH∘B=+36 kJ
mol−1
H2(g)+12O2(g)→H2O(l), ΔrH∘C=−285 kJ
mol−1
H2O(l)→H2O(g), ΔrH∘D=+44 kJ
mol−1
Express your answer with the appropriate units.