The brown gas NO
2 and the colorless gas N
2O
4 exist in equilibrium, 2NO
2
N
2O
4. In an experiment, 0.625 mole of N
2O
4 was introduced into a 5.00 L vessel and was allowed to decompose until equilibrium was reached. The concentration of N
2O
4 at equilibrium was 0.0750 M. Calculate K
c for the reaction.
◦ 7.5
◦ 0.125
◦ 0.0750
◦ 0.10
◦ 0.050