分子量
分子量，又称“相对分子质量”，指组成分子个所有原子个原子量个总和，分子量个符号为Mr。定义为物质分子或特定单元个平均质量搭12C质量个1/12之比值。由于是相对值，所以为无量纲量，单位为1。
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