Question

ammonia (NH3(g) Hf=-45.9 kJ/mol) reacts. with oxygen to produce nitrogen and water (H2O(g) Hf = -241.8 kJ/mol according to the equation below. 4NH3(g) + 3O2(g)---> 2N2(g) +6H2O(g) what is the enthalpy of the reaction

Answer 1

Answer:The answer given is 100% correct. I think kids are just looking at the wrong problem thats why it has a 2 star.. B is correct

Explanation:edge 2020

Answer 2

ΔH°_rxn = -195.9 kJ·mol⁻¹

Step-by-step explanation:

4NH₃(g) + 3O₂(g) ⟶ 2N₂(g) +6H₂O(g)

ΔH°_f/(kJ·mol⁻¹): -45.9 0 0 -241.8

The formula relating ΔH°_rxn and enthalpies of formation (ΔH°_f) is

ΔH°_rxn = ΣΔH°_f(products) – ΣΔH°_f(reactants)

ΣΔH°_f(products) = -6(241.8) = -1450.8 kJ

ΣΔH°_f(reactants) = -4(45.9) = -183.6 kJ

ΔH°_rxn = (-1450.8 + 183.6) kJ = -1267.2 kJ