Calculate the standard reaction enthalpy for the oxidation of nitric acid to nit

Question

Calculate the standard reaction enthalpy for the oxidation of nitric acid to nitrogen dioxide, 2NO(g) + O2(g) ----> 2NO2(g) from the standard reaction enthalpies of: N2(g) + O2 ------> 2NO(g) DH = +180.5 kJ x mol-1 2NO2 (g) --------> N2(g) + 2O2(g) DH = -66.4 kJ x mol-1

Explanation / Answer

flip the upper formula resulting in 2NO(g) ---> N2(g) + O2(g) Delta H -180.5kJ and add it together with the bottom one resulting in 2NO(g)+N2(g) + 2O2(g) ---> N2(g) + O2(g) + 2NO2 common things cancel out resulting in 2NO(g) + O2(g) --->2NO2(g) add the enthalpies up resulting in Delta H= -114.1

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