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Based on the following thermochemical eq...

Based on the following thermochemical equations
`H_(2)O(g)+C(s)rarrCO(g)+H_(2)(g),DeltaH=131KJ`
`CO(g)+1//2O_(2)(g)rarrCO_(2)(g),DeltaH=-282KJ`
`H_(2)(g)+1//2O_(2)(g)rarrH_(2)O(g),DeltaH=-242KJ`
`C(s)+O_(2)(g)rarrCO_(2)(g),DeltaH=XKJ`
The value of `X` will be

A

`-393 kJ`

B

`-655 kJ`

C

`+393 kJ`

D

`+655 kJ`

Text Solution

Verified by Experts

The correct Answer is:
A
Eq. `(i) : H_(2)O(g)+C(s)toCO(g)+H_(2)(g)`, `DeltaH=131 kJ`
Eq. `(ii) : CO(g)+(1)/(2)O_(2)(g)toCO_(2)(g)`, `DeltaH=-282 kJ`
Eq. `(iii) : H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g)`, `DeltaH=-242 kJ`
`C(s)+O_(2)(g)toCO_(2)(g)`, `DeltaH=-393 kJ`
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