The standard enthalpies fo formation of `CO_(2) (g), H_(2) O (1)`, and glucose (s) at `25^(@)C` are `- 400 kJ mol^(-1), - 300 kJ mol^(-)`, and `- 1300 kJ mol^(-1)`, respectively. The standard enthalply of combustion per gram of glucose at `25^(@)C` isA. `+2900 kJ`B. `-2900 kJ`C. `-16.11 kJ`D. `+16.11 kJ`

The standard enthalpies fo formation of `CO_(2) (g), H_(2) O (1)`, and

1.	The standard enthalpies fo formation of `CO_(2) (g), H_(2) O (1)`, and glucose (s) at `25^(@)C` are `- 400 kJ mol^(-1), - 300 kJ mol^(-)`, and `- 1300 kJ mol^(-1)`, respectively. The standard enthalply of combustion per gram of glucose at `25^(@)C` isA. `+2900 kJ`B. `-2900 kJ`C. `-16.11 kJ`D. `+16.11 kJ`
Answer» Correct Answer - C `C_(6)H_(12)O_(6)(s)+6O_(2)(g)to2CO_(2)(g)+6H_(2)(l)` `Delta_(f)^(@)=DeltaCH^(@)=[6DeltafH^(@)(CO_(2))+6DeltaH_(f)^(@)H(H_(2)O)_(6)]-[Delta^(@)(C_(6)H_(12)O_(6))+6DeltafH^(@)*O_(2)]` `=6xx(-400)+6xx(-300)-(1300)` `=-2900 kJ//mol` `=-(2900)/(180)kJ//g=16.11 kJ//g`

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