一定条件下进行反应:\(\rm{COCl_{2}(g)⇌Cl_{2}(g)+CO(g)}\),向\(\rm{2.0L}\)恒容密闭容器中充入\(\rm{1.0mol}\) \(\rm{COCl_{2}(g)}\),经过一段时间后达到平衡。反应过程中测得的有关数据见表:
\(\rm{t/s}\) | \(\rm{0}\) | \(\rm{2}\) | \(\rm{4}\) | \(\rm{6}\) | \(\rm{8}\) |
\(\rm{n(Cl_{2})/mol}\) | \(\rm{0}\) | \(\rm{0.30}\) | \(\rm{0.39}\) | \(\rm{0.40}\) | \(\rm{0.40}\) |
下列说法正确的是\(\rm{(}\) \(\rm{)}\)