In an experiment, 2.0 moles of NOCl was placed in a one-litre flask and the concentration of NO after equilibrium was found to be . The equilibrium constant at 30 °C is .

Question

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Step 1 — ICE table (V = 1 L, initial [NOCl] = 2.0 M):

| | NOCl | NO | Cl₂ |
|--|--|--|--|
| Initial | 2.0 | 0 | 0 |
| Change |  |  |  |
| Equil. |  |  |  |

Given:  M

Step 2 — Equilibrium concentrations:

M,  M,  M

Step 3 — Calculate :

Step 4 — Express as required:

(nearest integer, using the exact value from the question data)

Answer: 710

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