question_answer

Calculate the heat of combustion of glucose from the following data -

(i) \[{{C}_{\left( graphite \right)}}\,\,+\,\,{{O}_{2}}\,\,\left( g \right)\,\,\xrightarrow{{}}\,\,C{{O}_{2}}\,\left( g \right),\,\,\Delta H\,\,=\,\,-395.0\,\,kJ\]

(ii) \[{{H}_{2}}\,\,\left( g \right)\,\,+\,\,{}^{1}/{}_{2}{{O}_{2}}\,\,\xrightarrow{{}}\,\,{{H}_{2}}O\,\left( l \right),\,\,\Delta H\,\,=\,\,-269.5\,\,kJ\]

(iii) \[6{{C}_{\left( graphite \right)}}\,\,+\,\,6{{H}_{2}}\,\left( g \right)\,\,+\,\,3{{O}_{2}}\,\left( g \right)\,\,\xrightarrow{{}}\,\,{{C}_{6}}{{H}_{12}}{{O}_{6}}\,\,\left( s \right),\]\[\Delta H\,\,=\,\,-1170\,\,kJ\]

Answer:

-2817