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230问答网 > 如图是一定质量理想气体的p-V图线，若其状态由a→b→c→a（ab为等容过程，bc为等压过程，ca为等温过程）

如图是一定质量理想气体的p-V图线，若其状态由a→b→c→a（ab为等容过程，bc为等压过程，ca为等温过程）

2025-04-07 00:11:37

推荐回答（1个）

回答1：

A、由图示图象可知，Va=Vb＜Vc，则单位体积的分子数关系为：n_a=n_b＞n_c，故A错误；
B、ca为等温变化，Ta=Tc，ab为等容变化，p_a＞p_b，由查理定律可知，Ta＞Tb，则Ta=Tc＞Tb，分子的平均速率v_a=v_c＞v_b，故B错误；
C、由A、B可知，n_a=n_b＞n_c，v_a=v_c＞v_b，c状态分子数密度最小，单位时间撞击器壁的分子数最少，a与b状态的分子数密度相等，但a状态的分子平均速率大，单位时间a状态撞击器壁的分子数多，则气体分子在单位时间内对器壁单位面积碰撞次数N_a＞N_b＞N_c，故C正确，D错误；
故选：C．

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