Consider the reaction of glucose with oxygen: C6H12O6(s) 6O2(g) Right arrow. 6CO2(g) 6H2O(l) The enthalpy of formation (Delta. Hf) for C6H12O6(s) is –1,273. 02 kJ/mol, Delta. Hf for CO2(g) is –393. 5 kJ/mol, and Delta. Hf for H2O(l) is –285. 83 kJ/mol. What is Delta. Hf for O2(g)?.