Calculate the standard enthalpy of formation of carbon dioxide from its elements under standard conditions given the following information:- The standard enthalpy of combustion of carbon to CO2 is -393.5 kJ/mol- The standard enthalpy of combustion of hydrogen to H2O is -285.8 kJ/mol- The standard enthalpy of formation of water is -241.8 kJ/mol.Note: The standard enthalpy of formation of an element in its standard state is zero.

Question

Calculate the standard enthalpy of formation of carbon dioxide from its elements under standard conditions given the following information:- The standard enthalpy of combustion of carbon to CO2 is -393.5 kJ/mol- The standard enthalpy of combustion of hydrogen to H2O is -285.8 kJ/mol- The standard enthalpy of formation of water is -241.8 kJ/

Answer 1

We are given the following information:1. The standard enthalpy of combustion of carbon to CO2  Hc C   is -393.5 kJ/mol.2. The standard enthalpy of combustion of hydrogen to H2O  Hc H2   is -285.8 kJ/mol.3. The standard enthalpy of formation of water  Hf H2O   is -241.8 kJ/mol.We want to find the standard enthalpy of formation of carbon dioxide  Hf CO2  .Since the standard enthalpy of formation of an element in its standard state is zero, we can write the following equations for the combustion reactions:Hc C  = Hf CO2  - Hf C  = -393.5 kJ/mol  1 Hc H2  = Hf H2O  - Hf H2  = -285.8 kJ/mol  2 We can rearrange equation  1  to find Hf CO2 :Hf CO2  = Hc C  + Hf C  = -393.5 kJ/mol + 0 = -393.5 kJ/molSo, the standard enthalpy of formation of carbon dioxide from its elements under standard conditions is -393.5 kJ/mol.