10644 ???????????????????????????(1分)
?x4.4gx?106?4.4g?10.6g ????????????????????????(1分) 4410.6g?100%?88.3%......................................(1分) 12g(3)产生的CO2能溶于水,使烧杯和溶液的总质量比实际值大。 ...........(1分)
Na2CO3%?
全国化学奥赛竞赛初赛试卷第
11 页 (共8页)
2011年全国初中化学竞赛初赛试题
10644???????????????????????????(1分)?x4.4gx?106?4.4g?10.6g????????????????????????(1分)4410.6g?100%?88.3%......................................(1分)12g(3)产生的CO2能溶于水,使烧杯和溶液的总质量比
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