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How is 3M correct? Can someone please explain in detail how this is the answer? For...

How is 3M correct? Can someone please explain in detail how this is the answer?

For the reaction 4NH3(g) + 3O2(g) → 2N2(g) + 6H2O(g), K = 1080 at a certain temperature. Initially, all reactants and products have concentrations equal to 12 M. What is the approximate concentration of oxygen at equilibrium?

1. 18 M
2. 6 M
3. 3 M correct
4. 0 M
5. 12 M

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