Zn + H2SO4 === ZnSO4 + H2↑
65 98 161 2
13g x y z
65/13g=98/x=161/y=2/z
x=19.6g
y=32.2g
z=0.4g
這種硫酸中溶質(zhì)的質(zhì)量分?jǐn)?shù) 19.6g/100g*100%=19.6%
反應(yīng)后所得溶液的溶質(zhì)質(zhì)量分?jǐn)?shù) 32.2g/(13g+100g-0.4g)*100%=28.6%32.2g/（100+13-0.4）g*100%=28.6%？？？？？？？反應(yīng)后所得溶液的溶質(zhì)質(zhì)量分?jǐn)?shù) 32.2g/(13g+100g-0.4g)*100%=28.6%所得溶液的溶質(zhì)質(zhì)量 32.2g所得溶液的質(zhì)量 13g+100g-0.4g=112.6g