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Comment on the thermodynamic stability o...

Comment on the thermodynamic stability of `NO(g)`, given
`1/2N_(2)(g)+1/2O_(2)(g)rarr NO(g), Delta_(r)H^(Θ)=90 kJ mol^(-1)`
`NO(g)+1/2O_(2)(g) rarr NO_(2)(g), Delta_(r)H^(Θ)=-74 kJ mol^(-1)`

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As energy is absorbed in the first reaction reaction `NO(g)` is unstable. As energy is released in the second reaction, `NO_(2)(g)` is stable. Thus, unstable `NO(g)` changes into the stable `NO_(2)(g)`.
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