A quantity of HI was sealed in a tube, heated to 425°C, and held at this temperature until equilibrium was reached. The concentration of HI in the tube at equilibrium was found to be 0.0706 moles/liter. Calculate the equilibrium concentration of H2 (and I2) for the reaction:
H2(g) + I2(g) 2HI(g) Kc = 54.6 at 425°C
a. 4.78 × 10^−3 M
b. 9.55 × 10^−3 M
c. 2.34 × 10^−3 M
d. 1.17 × 10^−3 M
e. 1.85 × 10^−4 M
Answer: b. 9.55 × 10^−3 M