A vessel contains three gases A, B and C in the equilibrium
`A iff 2B + C`
At equilibrium, the concentration of A was 3 M and that of B was 4 M. On doubling the volume of the vessel, the new equilibrium concentration of B was 3 M. Calculate K, and the initial equilibrium concentration of C.

Explanation

To solve the problem step by step, we will follow these steps:

### Step 1: Write the equilibrium expression
The equilibrium reaction is given as:
\[ A \rightleftharpoons 2B + C \]

The equilibrium constant \( K_c \) is defined as:
\[ K_c = \frac{[B]^2[C]}{[A]} \]
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