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` KJB. `-2900` KJC. `-16.11` KJD. `+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` KJB. `-2900` KJC. `-16.11` KJD. `+16.11 `KJ
Answer» Correct Answer - C `C_(6)H_(12)O_(6)(g) rarr 6CO_(2)(g) + 6H_(2)O(l)` `Delta_(c)H = 6 xx Delta_(f)H(CO_(2)) + 6 Delta_(f)H (H_(2)O) - Delta_(f)H(C_(6)H_(12)O_(6)) - 6Delta_(f)(O^(2),g)` `=6 xx (-400-300) - (-1300)-0` `=-4200 + 1300` =-2900KJ/mol For one gram of glucose, enthalphy of combustion `=-(2900)/(180) =-16.11 kJ//g`

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