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在两个密闭容器中,分别充有质量相同的甲、乙两种气体,若它们的温度和密度均相同,试根据甲、乙的摩尔质量(M)关系,判断下列说法正确的是()。

单选题
2022-04-12 13:26
A、若M<sub>(甲)</sub>>M<sub>乙</sub>,则气体体积:V<sub>(甲)</sub><V<sub>乙</sub>
B、若M<sub>(甲)</sub><M<sub>乙</sub>,则气体的压强:p<sub>(甲)</sub>>p<sub>乙</sub>
C、若M<sub>(甲)</sub>>M<sub>乙</sub>,则气体的摩尔体积:V<sub>(甲)</sub><V<sub>乙</sub>
D、若M<sub>(甲)</sub><M<sub>乙</sub>,则的分子数:N<sub>(甲)</sub><N<sub>乙</sub>
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正确答案
B

试题解析
A项,两个密闭容器中,分别充有等质量、等密度的甲、乙两种气体,根据ρ=m/V可知气体的体积相等,A错误;B项,若M(甲)n,由pV=nRT可知,气体的压强:p(甲)>p,B正确;C项,根据n=m/M,若M(甲)>M,则气体的物质的量:n(甲)V,故C错误;D项,根据n=m/M,若M(甲)N,故D错误;故选B。

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在两个密闭容器中,分别充有质量相同的甲、乙两种气体,若它们的温度和密度均相同,试根据甲、乙的摩尔质量(M)关系,判断下列说法正确的是()。
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