Calculate ΔH∘ in kilojoules for the reaction of ammonia (ΔH∘f=−46.1 kJ/mol) with O2 to yield nitric oxide NO (ΔH∘f=91.3 kJ/mol) and H2O(g) (ΔH∘f=−241.8 kJ/mol), a step in the Ostwald process for the commercial production of nitric acid.

Question

surry99 · Answer

Start by writing a balanced chemical reaction

anonymous · Answer

4NH3+5O2-->4NO+6H2O

surry99 · Answer

great...how do you calculate delta H for the reaction form the heats of formation?

anonymous · Answer

Isn't it just the summation of the reactants minus the summation of the products?

surry99 · Answer

Other way around...summation of products minus summation of reactants

surry99 · Answer

go ahead and do the calculation

anonymous · Answer

Okay so would it be [6(-241.8)+4(91.3)]-[4(-46.1)] = -901.2 ?

surry99 · Answer

The method looks correct...let me check the math...hang on

surry99 · Answer

Looks good...congratulations!

anonymous · Answer

Thank you so much!

surry99 · Answer

no problem at all