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Calculate the heat of combustion of benz...

Calculate the heat of combustion of benzene form the following data:
a. `6C(s) +3H_(2)(g) rarr C_(6)H_(6)(l), DeltaH = 49.0 kJ`
b. `H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.8 kJ`
c. `C(s) +O_(2) (g) rarr CO_(2)(g), DeltaH =- 389.3 kJ`

Text Solution

Verified by Experts

To calculate `DeltaH` of the following:
`C_(6)H_(6)(l) +(15)/(2)O_(2)(g) rarr 6CO_(2)(g) -3H_(2)O(l) DeltaH = ?`
`DeltaH = 3DeltaH_(2) +6DeltaH_(3) - DeltaH_(2)`
`=3 xx 285.8 +6 xx -389.3 - 49.0`
`=- 857.4 - 2335.8 - 49`
`=- 3242.2 kJ mol^(-1)`
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