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江苏省扬中县八桥中学陈道生指出在国际单位制(SI)的基础上,我国于1984年2月27日公布了《中华人民共和国法定计量单位》,规定在全国施行,其中并规定了摩尔质量用“M”符号表示: 例M(H_2SO_4)=98g/mol即表示硫酸的摩尔质量是98克每摩尔,更替了过去习惯沿用的GM表示摩尔质量(克分子量)的符号。 但在目前高一化学课本“摩尔浓度”这一节中仍指出:摩尔浓度通常用M表示,致使不少的化学教师和部分省、市出版的化学书籍中都用“M”这个符号来表示“摩尔浓度”。例如:把171克蔗糖溶解在适量水里配成1升溶液,求
Chen Daosheng of Yangqiao County, Jiangsu Province, pointed out that on the basis of the International System of Units (SI), China promulgated the “Statistical Measurement Unit of the People’s Republic of China” on February 27, 1984, which was stipulated in the country and stipulated by Moore. The mass is indicated by the “M” symbol: Example M (H_2SO_4) = 98 g/mol indicates that the molar mass of sulfuric acid is 98 g/mol, which replaces the notation that the GM used to represent the molar mass (gram) in the past. However, in the present section of the chemistry textbook “Molar Concentration”, it is still pointed out that the molar concentration is usually expressed in M, which has caused many chemical teachers and some provinces and cities to publish chemical symbols in the book “M”. “Molarity”. For example: Dissolve 171 grams of sucrose in an appropriate amount of water to make up 1 liter of solution.