Josh B.

# Im stuck on a chemistry problem

Dinitrogen trioxide is the product of the reaction shown below. When dissolved in water, it forms nitrous acid, which has many applications in industrial chemistry.

NO (g) + NO2 (g) → N2O3 (g) ΔH = ?

Calculate the change in enthalpy for the above reaction using Hess’s law and the data given below

2N2 (g) + 3O2 (g) → 2N2O3 (g)    ΔH = 167.4 kJ

N2 (g) + O2 (g) → 2NO (g)    ΔH = 180.4 kJ

N2 (g) + 2O2 (g) → 2NO2 (g)    ΔH = 66.4 kJ

By:

Cooper G.

Why do you flip the sign in eq. 3 but not in eq. 2?
Report

7d

J.R. S.

tutor
If you flip the equation you should change the sign. I think I did change the sign from +66.4 to -66.4 /2 = -33.2
Report

7d

J.R. S.

tutor
Upon further inspection, I did forget to change the sign when reversing equation 2. It should be -90.2 . My bad and my apologies.
Report

3d

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