電子課本網(wǎng) › 第34頁(yè)

第34頁(yè)

信息發(fā)布者：

1.6

 解：設(shè)該固體樣品中$CaO_{2}$的質(zhì)量為$x。$

 $2CaO_{2}+2H_{2}O = 2Ca(OH)_{2}+O_{2}\uparrow$

    $144$                                              $32$  

      $x$                                               $1.6g$

 $\frac{144}{32}=\frac{x}{1.6g}$ ，$x = 7.2g$

 該固體樣品中$CaO_{2}$的質(zhì)量分?jǐn)?shù)為$\frac{7.2g}{20g}\times100\% = 36\%$

 答：該固體樣品中$CaO_{2}$的質(zhì)量分?jǐn)?shù)為$36\%。$

30

2.64

 解：設(shè)該樣品中碳酸鈣的質(zhì)量為$x。$

 $CaCO_{3}+2HCl = CaCl_{2}+H_{2}O+CO_{2}\uparrow$

     $100$                                                     $44$

       $x$                                                     $2.64g$

 $\frac{100}{44}=\frac{x}{2.64g}$， $x = 6g$

 該樣品中碳酸鈣的質(zhì)量分?jǐn)?shù)為$\frac{6g}{10g}\times100\% = 60\%$

 答：該樣品中碳酸鈣的質(zhì)量分?jǐn)?shù)為$60\%。$

亚洲激情+欧美激情,无码任你躁久久久久久,我的极品美女老婆,性欧美牲交在线视频,亚洲av高清在线一区二区三区