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Air contain about 99% of N(2) and O(2) g...

Air contain about 99% of `N_(2)` and `O_(2)` gases. Why do not they combine to form NO under the standard conditions? Standard Gibbs energy of formation of `NO(g)` is `86.7 kJ mol^(-1)`.

Text Solution

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Standard free energy of formation `( Delta_(f)G^(@))` for the reaction `(1)/(2)N_(2)(g)+(1)/(2)O_(2)(g) rarr NO(g0` is positive ( equal to `+86.7 kJ mol^(-1))`. Hence, the reaction is non-spontaneous under the standard conditions.
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