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Consider the reaction : 4NO(2)(g) + O(...

Consider the reaction :
`4NO_(2)(g) + O_(2)(g) rarr 2N_(2)O_(5)(g), Delta_(f)H = -111 kJ`
If `N_(2)O_(5)(s)` is fromed instead of `N_(2)O_(5)(g)` in the above reaction, the `Delta_(f)H` is value will be (given, `Delta H` of sublimation for `N_(2)O_(5)` is `54 kJ mol^(-1)`).

A

`+ 54 kJ`

B

`+ 219 kJ`

C

`- 219 kJ`

D

`- 165 kJ`

Text Solution

Verified by Experts

The correct Answer is:
C
`4NO_(2) + O_(2) rarr 2N_(2)O_(5) (g) Delta H = -111 kJ`
`2N_(2)O_(5) (s) rarr 2N_(2)O_(5) (g) Delta H = 54 xx 2 kJ`
Subtracting
`4NO_(2) + O_(2) rarr 2N_(2)O_(5) (s) Delta H = - 219 kJ`
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