Find Kc for the reaction

Question

The following reaction was performed in a sealed vessel at 723 ∘C :
H2(g)+I2(g)⇌2HI(g)
Initially, only H2 and I2 were present at concentrations of [H2]=3.10M and [I2]=2.20M. The equilibrium concentration of I2 is 0.0300 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Answer 1

......H₂(g)  +  I₂(g) ====> 2HI(g)....

I....3.10...........2.2...............0.........

C..-2.17.......-2.17............+2x2.17....

E...0.93........0.030...........4.17.........

 

Kc = [HI]²/[H₂][I₂]

Kc = (4.17)²/(0.93)(0.03)

Kc = 623