4.
某温度下,向\(\rm{2L}\)恒容密闭容器中充入\(\rm{1.0molA}\)和\(\rm{1.0molB}\),反应\(\rm{A(g)+B(g)⇌ C(g)}\),经过一段时间后达到平衡。反应过程中测定的部分数据如下表:
\(\rm{t/s}\) | \(\rm{0}\) | \(\rm{5}\) | \(\rm{15}\) | \(\rm{25}\) | \(\rm{35}\) |
\(\rm{n(A)/mol}\) | \(\rm{1.0}\) | \(\rm{0.85}\) | \(\rm{0.81}\) | \(\rm{0.80}\) | \(\rm{0.80}\) |
下列说法正确的是\(\rm{(}\) \(\rm{)}\)