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Based on the following thermochemical eq...

Based on the following thermochemical equations
`H_(2)O(g) + C(s) rarr CO(g) + H_(2)(g), Delta H= 131kJ`
`CO(g) + (1)/(2) O_(2) (g) rarr CO_(2)(g), Delta H= -282kJ`
`H_(2)(g)+ (1)/(2) O_(2) (g) rarr H_(2)O(g), Delta H= -242kJ`
`C(s) + O_(2)(g) rarr CO_(2) (g), Delta H= X kJ`
The value of X is

A

`-393` kJ

B

`-655 kJ`

C

`+393 kJ`

D

`+655` kJ

Text Solution

Verified by Experts

The correct Answer is:
A
`H_(2)O(g) + C(s) rarr CO(g) + H_(2)(g), Delta H_(1)= 131kJ` ...(i)
`CO(g) + (1)/(2) O_(2)(g) rarr CO_(2) (g), Delta H_(2)= -282kJ` ...(ii)
`H_(2)(g) + (1)/(2) O_(2)(g) rarr H_(2)O(g), Delta H_(3)= -242kJ` ...(iii)
By adding eq (i), (ii) and (iii)
`H_(2)O + C + CO + O_(2) + H_(2) rarr CO + H_(2) + CO_(2) + H_(2)O`
`C+ O_(2) rarr CO_(2)`
`therefore Delta H_(1) + Delta H_(2) + Delta H_(3)= 131-282 - 242= -393kJ`
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