Question

如圖是病人輸液時用的一瓶葡萄糖注射液標簽，請根據(jù)標簽給出的數(shù)據(jù)計算該溶液的質(zhì)量是

 

g，其中含水

 

克．該溶液的密度是

 

g/mL．

Answer 1

考點：有關溶質(zhì)質(zhì)量分數(shù)的簡單計算

專題：溶液的組成及溶質(zhì)質(zhì)量分數(shù)的計算

分析：利用溶質(zhì)質(zhì)量=溶液質(zhì)量×溶質(zhì)的質(zhì)量分數(shù)，溶液質(zhì)量=溶液質(zhì)量÷溶質(zhì)的質(zhì)量分數(shù)，可根據(jù)溶質(zhì)的質(zhì)量和溶質(zhì)的質(zhì)量分數(shù)計算出溶液的質(zhì)量；再根據(jù)溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量即可求得水的質(zhì)量．

解答：解：溶質(zhì)質(zhì)量=溶液質(zhì)量×溶質(zhì)的質(zhì)量分數(shù)，則溶液質(zhì)量=溶液質(zhì)量÷溶質(zhì)的質(zhì)量分數(shù)，由題意，250mL的葡萄糖注射液中含葡萄糖12.5g，溶質(zhì)質(zhì)量分數(shù)為5%，則該溶液的質(zhì)量是12.5g÷5%=250g．
溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量，則含水的質(zhì)量為250g-12.5g=237.5g．
溶液的密度為

250g

250mL

=1g/mL．
故答案為：250；237.5；1．

點評：本題難度不大，掌握溶質(zhì)質(zhì)量分數(shù)的有關計算并能靈活運用是正確解答本題的關鍵．