質(zhì)量分?jǐn)?shù)計(jì)算舉例質(zhì)量分?jǐn)?shù)（mass fraction）指溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)是溶質(zhì)質(zhì)量與溶液質(zhì)量之比.也指混合物中某種物質(zhì)質(zhì)量占總質(zhì)量的百分比

溶質(zhì)質(zhì)量分?jǐn)?shù)
　 　溶質(zhì)質(zhì)量分?jǐn)?shù)是指溶質(zhì)質(zhì)量與溶液質(zhì)量之比. 　　或化合物中各原子的質(zhì)量之比.（如HCHO、CH3COOH、C6H12O6） 　　應(yīng)該注意： 　?、偃苜|(zhì)的質(zhì)量分?jǐn)?shù)只表示溶質(zhì)質(zhì)量與溶液質(zhì)量之比,并不代表具體的溶液質(zhì)量和溶質(zhì)質(zhì)量. 　　②溶質(zhì)的質(zhì)量分?jǐn)?shù)一般用百分?jǐn)?shù)表示. 　?、廴苜|(zhì)的質(zhì)量分?jǐn)?shù)計(jì)算式中溶質(zhì)質(zhì)量與溶液質(zhì)量的單位必須統(tǒng)一. 　?、苡?jì)算式中溶質(zhì)質(zhì)量是指被溶解的那部分溶質(zhì)的質(zhì)量,沒有被溶解的那部分溶質(zhì)質(zhì)量不能計(jì)算在內(nèi).