19. 恒温条件下，若将恒容密闭容器改为恒压密闭容器，则达到平衡时， $\mathrm { H } _ { 2 }$ 的浓度
A．增大 B．减小 C．不变
原因是
平衡常数与转化率 · 历年高考化学真题与解析
本页汇总 高考真题检索 的「平衡常数与转化率」高考化学真题共 1 道，覆盖 2026 年，最常出题型为 解答题；含完整答案与解析。
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