question_answer
The heat evolved on combustion of 1 gm starch \[{{\left( {{C}_{6}}{{H}_{10}}{{O}_{5}} \right)}_{n}}\] into \[C{{O}_{2}}\] and \[{{H}_{2}}O\,\left( \ell \right)\] is \[17.49\,\,kJ\,\,g{{m}^{-1}}.\] Compute the enthalpy of formation of 1 gm starch. Given \[\Delta {{H}_{f}}\,\,of\,\,{{H}_{2}}O\,\,\left( \ell \right)\,\,=\,\,-\,285.85\,\,kJ\,\,mo{{l}^{-1}},\] \[\Delta {{H}_{f}}\,\,of\,\,C{{O}_{2}}\,\,=\,\,-293.7\,\,kJ\,\,mol{{e}^{-1}}\]