Question

Calculate the standard enthalpy of formation of carbon dioxide gas (CO2) given the following information: C(s) + O2(g) → CO2(g)          ΔH = -393.5 kJ/mol H2(g) + 1/2O2(g) → H2O(l)          ΔH = -285.8 kJ/mol 2C(s) + 2H2(g) + 5/2O2(g) → 2CO2(g) + 2H2O(l)            ΔH = -890.4 kJ/mol

Answer 1

To calculate the standard enthalpy of formation of CO2, we can use the given reactions and their respective enthalpy changes. The standard enthalpy of formation of CO2 is the enthalpy change for the reaction:C s  + O2 g   CO2 g From the given information, we already have the enthalpy change for this reaction:H = -393.5 kJ/molTherefore, the standard enthalpy of formation of carbon dioxide gas  CO2  is -393.5 kJ/mol.