The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant.
H2(g) + Cl2(g) = 2 HCl(g) Kc = 3.8 x 10^4
2 HCl(g) = H2(g) + Cl2(g) Kc = ?
A) 1.9 x 10^4
B) -3.8 x 10^4
C) 2.6 x 10^-5
D) 6.4 x 10^-4
E) 3.8 x 10^-4