温度为\(\rm{T}\)时,向\(\rm{2.0L}\)恒容密闭容器中充入\(\rm{2.0molNO_{2}}\),反应\(\rm{2NO_{2}(g)⇌N_{2}O_{4}(g)}\)经一段时间后达到平衡\(\rm{.}\)反应过程中测定的部分数据见下表:
\(\rm{t/s}\) | \(\rm{0}\) | \(\rm{50}\) | \(\rm{150}\) | \(\rm{250}\) | \(\rm{350}\) |
\(\rm{n(N_{2}O_{4})/mol}\) | \(\rm{0}\) | \(\rm{0.12}\) | \(\rm{0.18}\) | \(\rm{0.20}\) | \(\rm{0.20}\) |
下列说法正确的是\(\rm{(}\) \(\rm{)}\)