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 -1300 kJ/mol, respectively. The standard enthalpy of combustion per gram of glucose at 25^(@)C is :

Answer»

`+2900 kJ`
`-2900 kJ`
`-16.11 kJ`
`+16.11 kJ`

Solution :`C_(6)H_(12)O_(6) (s)+6O_(2)(g) rarr 6CO_(2)(g) +6H_(2)O(l)`
`DeltaH_("comb. "C_(6)H_(12)O_(6))^(@)=6 DeltaH_(f CO_(2))^(@)+6DeltaH_(f H_(2)O(l))^(@)-DeltaH_(f C_(6)H_(12)O_(6)(s))^(@)`
`=6XX(-400)+6 xx(-300) -(-1300)`
`=-2900" kJ/mol"`
`:.` Stadard enthalpy of combustion PER gram of glucose `=(-2900)/180=-16.11 kJ`


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