Chemistry · EQUILIBRIUM

For the reaction \( 4\text{NH}_3(\text{g}) + 5\text{O}_2(\text{g}) \rightleftharpoons 4\text{NO}(\text{g}) + 6\text{H}_2\text{O}(\text{g}) \), the correct expression for the equilibrium constant \( K_c \) is:

1. \( \frac{[\text{NH}_3]^4 [\text{O}_2]^5}{[\text{NO}]^4 [\text{H}_2\text{O}]^6} \)
2. \( \frac{[\text{NO}]^4 [\text{H}_2\text{O}]^6}{[\text{NH}_3]^4 [\text{O}_2]^5} \)
3. \( \frac{4[\text{NO}] \cdot 6[\text{H}_2\text{O}]}{4[\text{NH}_3] \cdot 5[\text{O}_2]} \)
4. \( \frac{[\text{NO}] [\text{H}_2\text{O}]}{[\text{NH}_3] [\text{O}_2]} \)