某氯化鈉溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為16%,它表示( )
A.100g水中溶解了16g氯化鈉
B.100mL氯化鈉溶液中氯化鈉占16g
C.100mL溶液中氯化鈉占16mL
D.100g氯化鈉溶液中含氯化鈉16g
【答案】分析:溶質(zhì)質(zhì)量分?jǐn)?shù)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,利用此知識可解決此題.
解答:解:溶質(zhì)質(zhì)量分?jǐn)?shù)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,氯化鈉溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為16%的含義是每100g溶液中含有溶質(zhì)的質(zhì)量為16g
故選D
點評:此題是對溶質(zhì)質(zhì)量分?jǐn)?shù)的概念進行的考查,主要要求學(xué)生掌握以下規(guī)律:
①溶質(zhì)的質(zhì)量分?jǐn)?shù)只表示溶質(zhì)質(zhì)量與溶液質(zhì)量之比值,并不代表具體的溶液質(zhì)量和溶質(zhì)質(zhì)量是多少.
②溶質(zhì)的質(zhì)量分?jǐn)?shù)一般用百分?jǐn)?shù)表示.
③溶質(zhì)的質(zhì)量分?jǐn)?shù)計算式中溶質(zhì)質(zhì)量與溶液質(zhì)量的單位必須統(tǒng)一.