The standard enthalpies of formation of`CO_(2)(g), H_(2)O(l) ` and glucose (s)at `25^(@)C` are`-400 kJ //mol, - 300 kJ//mol` and`-1300kJ//mol` respectively.The standard enthalpy of combustion per gram of glucose at`25^(@)C` isA. ` + 2900kJ`B. ` -2900kJ`C. ` - 16.11kJ `D. `+16.11 kJ`

The standard enthalpies of formation of`CO_(2)(g), H_(2)O(l) ` and glu

1.	The standard enthalpies of formation of`CO_(2)(g), H_(2)O(l) ` and glucose (s)at `25^(@)C` are`-400 kJ //mol, - 300 kJ//mol` and`-1300kJ//mol` respectively.The standard enthalpy of combustion per gram of glucose at`25^(@)C` isA. ` + 2900kJ`B. ` -2900kJ`C. ` - 16.11kJ `D. `+16.11 kJ`
Answer» Correct Answer - C `C_(6)H_(12)O_(6)(s)+ 6O_(2)(g)rarr6 CO_(2)(g) +6 H_(2)O(l) ` `Delta_(r)H^(@) =Delta_(c) H^(@) = [ 6 Delta_(f)(CO_(2)) + 6 Delta_(f)H^(@) ( H_(2)O)]- [ Delta_(f) H^(@) ( C_(6)H_(12)O_(6)) + 6 Delta_(f) H^(@) ( O_(2))]` `= 6 xx ( - 400) + 6 ( - 300) -( - 1300)` `= -2900 kJ` `= - ( 2900)/( 180 ) kJ //g =- 16.11 kJ //g`

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The standard enthalpies of formation of`CO_(2)(g), H_(2)O(l) ` and glucose (s)at `25^(@)C` are`-400 kJ //mol, - 300 kJ//mol` and`-1300kJ//mol` respectively.The standard enthalpy of combustion per gram of glucose at`25^(@)C` isA. ` + 2900kJ`B. ` -2900kJ`C. ` - 16.11kJ `D. `+16.11 kJ`

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