question_answer

Enthalpy of combustion \[({{\Delta }_{C}}{{H}^{\bigcirc -}})\] for \[C{{H}_{4}},\] \[{{C}_{2}}{{H}_{6}}\] and \[{{C}_{3}}{{H}_{8}}\] are \[-200.0,-300.0\] and \[-400.0~kcal\text{ }mo{{l}^{-1}}\] respectively. \[{{\Delta }_{C}}{{H}^{\bigcirc -}}\]in Kcal for octane is

Answer:

-800