# Problem: 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.

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###### Problem Details

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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.

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Based on our data, we think this problem is relevant for Professor DesEnfants' class at MONTANA.