Question

13克Zn與100克稀硫酸恰好完全反應(yīng)，求反應(yīng)后所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)．______．

Answer 1

設(shè)生成硫酸鋅的質(zhì)量為x，生成氫氣的質(zhì)量為y
Zn+H₂SO₄═ZnSO₄+H₂↑
65         161   2
13g         x    y

65

13g

=

161

x

    x=32.2g

65

13g

=

2

y

    y=0.4g
反應(yīng)后所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為：

32.2g

13g+100g-0.4g

×100%=28.6%．
答：反應(yīng)后所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為為28.6%．