1.

the heat of combustion ofsoucrose , C_(12)H_(22)O_(11)(s) at constany volume is 1348.9 kcal mol ^(-1) at 25 ^(@) then the heat of reaction at constant pressure when steam is produced is

Answer»

`-1348. 9 kcal `
`-1342.34 kcal`
`+ 1250 Kcal `
none of these

Solution :the COMBUSTION equaion of sucrose is
`C_(12)H_(22)O_(11)(s)+120_(2)(g)to12CO_(2)(g)+11H_(2)O(g)`
here , `DELTAH=12 + 11 -12=11`
As we know `DeltaH=DeltaE= + DeltanRT`
`DeltaH=(- 1348.9 xx10^(3))+ 11xx2xx298=-1342.34 kcal`


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