the heat of combustion of soucrose , `C_(12)H_(22)O_(11)(s)` at constany volume is `1348.9 kcal mol ^(-1) at 25 ^(@)` then the heat of reaction at con

Question

the heat of combustion of soucrose , `C_(12)H_(22)O_(11)(s)` at constany volume is `1348.9 kcal mol ^(-1) at 25 ^(@)` then the heat of reaction at con

the heat of combustion of soucrose , `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
A. `-1348. 9 kcal `
B. `-1342.34 kcal`
C. `+ 1250 Kcal `
D. none of these

Monjur Alahi

6 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - b
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`

6 views Answered 2023-02-05 15:29