Wednesday
September 3, 2014

Homework Help: Chem

Posted by Meg on Tuesday, June 17, 2014 at 8:13pm.

Set up a Hessís law cycle, and use the following information to calculate ΔH∘f for aqueous nitric acid, HNO3(aq). You will need to use fractional coefficients for some equations.
3NO2(g)+H2O(l)→2HNO3(aq)+NO(g) ΔH∘ = -137.3 kJ
2NO(g)+O2(g)→2NO2(g) ΔH∘ = -116.2 kJ
4NH3(g)+5O2(g)→4NO(g)+6H2O(l) ΔH∘ = -1165.2 kJ
NH3(g) ΔH∘f = -46.1 kJ
H2O(l) ΔH∘f = -285.8 kJ

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