Question

試計(jì)算用9g氯化鈉能夠配制溶質(zhì)的質(zhì)量分?jǐn)?shù)為15%的氯化鈉溶液多少克？

Answer 1

【答案】分析：由溶質(zhì)質(zhì)量和溶質(zhì)的質(zhì)量分?jǐn)?shù)，根據(jù)溶質(zhì)質(zhì)量分?jǐn)?shù)的相關(guān)計(jì)算公式可以計(jì)算出需要溶液的質(zhì)量，溶液質(zhì)量=溶質(zhì)質(zhì)量÷溶質(zhì)質(zhì)量分?jǐn)?shù)．
解答：解：設(shè)能配制15%的氯化鈉溶液的質(zhì)量為x．
15%x=9g
    X=60g
 答：能配制15%的氯化鈉溶液的質(zhì)量為60g．
點(diǎn)評(píng)：根據(jù)溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)=×100%，若已知其中任意兩個(gè)值都可以計(jì)算出第三個(gè)量．