Practice: The oxidation of ammonia is illustrated by the following equation:
Calculate the enthalpy of reaction, ΔHRxn, based on the given standard heats of formation.
The Enthalpy of Formation for an element is a key component in determining the enthalpy of reaction.
Enthalpy of Formation
Concept #1: Enthalpy of Formation
Example #1: The reaction of methane with chlorine gas is illustrated by the reaction below:
Calculate the ∆Horxn if the standard enthalpies of formation for CH4 , CCl4 , and HCl are –74.87 kJ/mol, –139 kJ/mol and –92.31 kJ/mol respectively.
Practice: Consider the following equation:
2 ClF3(g) + 2 NH3(g) → 1 N2(g) + 6 HF (g) + 6 Cl2(g) ΔHrxn = –1196 kJ
Determine the standard enthalpy of formation for chlorine trifluoride, ClF3.
