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N(2(g))+2O(2(g)) rarr 2NO(2) +X kJ 2NO...

`N_(2(g))+2O_(2(g)) rarr 2NO_(2) +X kJ`
`2NO_((g))+O_(2(g)) rarr 2NO_(2(g))+Y kJ`
The enthalpy of formation of `NO` is

A

`(2X-2Y)`

B

`X-Y`

C

`1//2(Y_X)`

D

`1//2(X-Y)`

Text Solution

Verified by Experts

`N_(2)(g)+2O_(2)(g)rarr 2NO_(2)(g),DeltaH =+X kJ …(i)`
`2NO(g) +O_(2)(g) rarr 2NO_(2)(g),DeltaH =+YkJ …(ii)`
Substracting equation (ii) from equation (i), we get
`N_(2)(g) +O_(2)(g) rarr 2NO(g),DeltaH = X-Y`
or `Delta_(f)H^(Theta) (NO) = ((X-Y))/(2) kJ mol^(-1)`
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