The kc is 8.08 x 10 -4 for the temp of 1756k. If the initial concentration of Br 2(g) was 3.2 m, what are the equilibrium concentrations?

The kc is 8.08 x 10-4 for the temp of 1756k. If the initial concentration of Br2(g) was 3.2 m, what are the equilibrium concentrations? If after you get to equilibrium you add an extra 1.3 m of Br2(g), what is the Q value and what would be the new equilibrium concentration? How do I start this? Do I have to do ICE?

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