26. Ethylene on combustion gives carbon dioxide and water. Its enthalp

1.	26. Ethylene on combustion gives carbon dioxide and water. Its enthalpy of combustion is1410.0 KJ/mol. If the enthalpy of formation of carbon dioxide and water are 393.3 KJ and286.2 KJ respectively. Calculate the enthalpy of formation of ethylene.
Answer» Following is the naswer to above question 2H2 (g) + (5/2)O2 (g) ----------->CO2 (g) + H2O Heat of Reaction (Rxn) = -1299kJ/mol Standard formation [CO2 (g)]= -393.5 kJ/mol Standard formation [H2O (l)] = -285.8 kj/mol Hence the heat of formation of the reaction is 226 kJ/mol

26. Ethylene on combustion gives carbon dioxide and water. Its enthalpy of combustion is1410.0 KJ/mol. If the enthalpy of formation of carbon dioxide and water are 393.3 KJ and286.2 KJ respectively. Calculate the enthalpy of formation of ethylene.

Answer»

Following is the naswer to above question

2H2 (g) + (5/2)O2 (g) ----------->CO2 (g) + H2O

Heat of Reaction (Rxn) = -1299kJ/mol

Standard formation [CO2 (g)]= -393.5 kJ/mol

Standard formation [H2O (l)] = -285.8 kj/mol

Hence the heat of formation of the reaction is 226 kJ/mol