calculate the value of change of enthalphy of formation
CHEM112 â Week 2 Page 1 of 1 Calculate Î´HÂº rxn using Standard Enthalpy of Formation When all the standard enthalpy values of formation for the species in a chemical reaction are known at standard conditions, the following equation can be used to calculate the enthalpy change for a reaction.xample: Calculate the enthalpy change for the following reaction using standard enthalpy values found in a table of thermodynamic values. 2C 2 H 6 (g) + 7O 2 (g) â 4CO 2 (g) + 6H 2 O(g) Î´HÂº rxn = Solution: Look up the values for C 2 H 6 (g), CO 2 (g), and H 2 O(g) in a table of thermodynamic values.