Chemistry Practice Problems Hess's Law Practice Problems Solution: Calculate the enthalpy of the reaction4B(s) + 3O2(...

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Solution: Calculate the enthalpy of the reaction4B(s) + 3O2(g) → 2B2O3(s)given the following pertinent information:B2O3(s) + 3H2O(g) → 3O2(g) + B2H6(g),      ΔH∘A=+2035 kJ2B(s) + 3H2(g) → B2H6(g),                            ΔH∘B=+36 kJH2(g) + 1/2 O2(g) → H2O(l),                            Δ  H∘C=−285 kJH2O(l) → H2O(g),                                          ΔH∘D=+44 kJExpress your answer with the appropriate units.

Problem

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),      ΔHA=+2035 kJ

2B(s) + 3H2(g) → B2H6(g),                            ΔHB=+36 kJ

H2(g) + 1/2 O2(g) → H2O(l),                            Δ  HC=−285 kJ

H2O(l) → H2O(g),                                          ΔHD=+44 kJ

Express your answer with the appropriate units.