Question

4．實(shí)驗室現(xiàn)有200g硝酸鉀溶液，已知其溶質(zhì)與溶劑的質(zhì)最比為7：13，則該硝酸鉀溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)為（　�。�

• A． 65%
• B． 54%
• C． 43%
• D． 35%

Answer 1

分析 根據(jù)溶質(zhì)質(zhì)量分?jǐn)?shù)是溶質(zhì)質(zhì)量與溶液質(zhì)量之比，據(jù)此結(jié)合題意進(jìn)行分析解答．

解答 解：溶質(zhì)質(zhì)量分?jǐn)?shù)是溶質(zhì)質(zhì)量與溶液質(zhì)量之比，已知其溶質(zhì)與溶劑的質(zhì)最比為7：13，所以該硝酸鉀溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)為$\frac{7}{7+13}×100%$=35%
故選：D．

點(diǎn)評 本題難度不大，掌握溶質(zhì)質(zhì)量分?jǐn)?shù)的概念、含義等并能靈活運(yùn)用是正確解答本題的關(guān)鍵．