D
分析:10g某固體物質(zhì)投入100g水中并沒(méi)有說(shuō)明全部溶解,同時(shí)也沒(méi)有說(shuō)明固體中是否含有結(jié)晶水,所以溶液中溶質(zhì)的質(zhì)量無(wú)法確定,可知溶質(zhì)質(zhì)量分?jǐn)?shù)也無(wú)法確定.
解答:若10g某固體物質(zhì)投入100g水中,振蕩、溶解,這10g固體中不含結(jié)晶水且全部溶解,那么所得溶液中溶質(zhì)質(zhì)量為10g,所得溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)的計(jì)算式為
×100%;若該10g固體中含有結(jié)晶水或者沒(méi)有全部溶解,溶液中溶質(zhì)的質(zhì)量就不是10g,且無(wú)法確定.所以溶液溶質(zhì)質(zhì)量分?jǐn)?shù)無(wú)法確定.
故選D.
點(diǎn)評(píng):溶質(zhì)質(zhì)量分?jǐn)?shù)是指溶質(zhì)質(zhì)量占溶液質(zhì)量的百分比,而溶液的質(zhì)量=溶質(zhì)質(zhì)量+溶劑質(zhì)量,因此,溶質(zhì)質(zhì)量分?jǐn)?shù)=
×100%.要注意審題,分析題意確定溶質(zhì)質(zhì)量是解題的關(guān)鍵.