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)`

Explanation

To comment on the thermodynamic stability of \( NO(g) \), we will analyze the given reactions and their enthalpy changes.

### Step 1: Analyze the first reaction
The first reaction is:
\[ \frac{1}{2} N_2(g) + \frac{1}{2} O_2(g) \rightarrow NO(g) \]
with \(\Delta_rH^{\Theta} = +90 \, \text{kJ mol}^{-1}\).
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