Problem: The combustion of ammonia is represented by the equation. 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)      ΔH=-904.8 kJ What is the enthalpy of formation of NH 3(g)?   Enthalpy of Formation Data NO(g)         +90.4 kJ/mol H2O(g)        -241.8 kJ/mol A) -449 kJ/mol         B) -46.1 kJ/mol           C) -184 kJ/mol       D) 227 kJ/mol

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The combustion of ammonia is represented by the equation.

4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)      ΔH=-904.8 kJ

What is the enthalpy of formation of NH 3(g)?  

Enthalpy of Formation Data
NO(g)         +90.4 kJ/mol
H2O(g)        -241.8 kJ/mol

A) -449 kJ/mol        

B) -46.1 kJ/mol          

C) -184 kJ/mol      

D) 227 kJ/mol

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