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Consider the gaseous reaction:

$$2NO + Cl_2⇄ 2 NOCl \quad \quad K_c = 2.0 \ \text{at 7600 K}$$

Equal concentrations of the reactants were placed in a reaction vessel and allowed to reach equilibrium. At equilibrium, the concentration of $NOCl$ was 2.0 M.

Which of the following are the initial concentrations of both reactants?

A

2.0 M

B

3.0 M

C

4.0 M

D

5.0 M

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