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Delta(f) H^(theta) of CO(2)(g), CO(g), N...

`Delta_(f) H^(theta)` of `CO_(2)(g), CO(g), N_(2)O(g)` and `NO_(2)(g)` are respectively `-393, -110.81` and 34 `("in "kJ mol^(-1))` at `27^(@)C`.
`Delta H` (in kJ) for the reaction :
`2NO_(2)(g) + 3CO(g) rarr N_(2)O(g) + 3CO_(3)(g)` is

A

836

B

1460

C

`-836`

D

`-1460`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta H = Delta H_(f^(@)) (N_(2)O) + 3 Delta H_(f^(@)) (CO_(2)) - (2 Delta H_(f^(@)) (NO_(2)) + 3 Delta H_(f^(@)) (CO_(2))`
`= 81 + 3 (-393) - (2 xx 34 + 3 (-110))`
`= - 836 kJ mol^(-1)`
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