摩爾質量
摩爾質量，記作M，單位g/mol，謂一摩爾化學元質或化合物之質量。可以質量比物量求之，公式： M = m n }} 。摩爾質量之值與相對分子質量、相對原子質量同。
說明
一摩爾者，含六點零二乘以十之二十三次方微粒也（即亞佛加厥數）。微粒之大小質量不一，故一摩爾之物質，其摩爾質量每異。故摩爾質量乃特徵量。試觀碳、氧，碳者質輕，故一摩爾微粒亦輕。氧者質重，故一摩爾微粒亦重。
另見
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