Calculating an Equilibrium Concentration

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Problem

At 1280˚ C the equilibrium constant (Kc) for the reaction

Br2  (g) ⇌ 2Br (g)

is 1.1 x 10^-3. If the initial concentrations are [Br2] = 0.063 M and [Br] = 0.012 M, calculate the concentrations of these species at equilibrium.

Answer:
Br2= 6,5x10^-2

Br= 8,4 x10^-3

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