Explain what is the equilibrium constant k_c

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Problem- The following reaction was performed in a sealed vessel at 712 C H_2(g) + I_2(g) (equilibrium symbol) 2 HI(g) Initially, only H_2 and I_2 were present at concentrations of H_2= 3.95 M and I_2= 3.00 M. The equilibrium concentration of I_2 is 0.0800 M . What is the equilibrium constant, K_c, for the reaction at this temperature?

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