卓嘎同學(xué)將14.4g含雜質(zhì)的純堿樣品(碳酸鈉與氯化鈉的混合物)與90g稀鹽酸相混合,恰好完全反應(yīng),測(cè)得反應(yīng)生成氣體的質(zhì)量(m)與反應(yīng)時(shí)間(t)的數(shù)據(jù)如下表所示:
反應(yīng)時(shí)間t/s |
t0 |
t1 |
t2 |
t3 |
t4 |
t5 |
t6 |
氣體質(zhì)量m/g |
0 |
0.88 |
1.76 |
2.64 |
3.52 |
4.4 |
4.4 |
(1)計(jì)算樣品中Na
2CO
3的質(zhì)量。
(2)計(jì)算完全反應(yīng)后所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)。(請(qǐng)寫出計(jì)算過程和步驟,計(jì)算結(jié)果保留到0.1%)