Question

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Answer 1

 

1.50g£»  

2.9.25%

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½â£º   ÉèÈÜÒºÖк¬ÂÈ»¯¸ÆµÄÖÊÁ¿Îªx

 Na₂CO₃   +     CaCl₂             CaCO₃   ¡ý +  2NaCl

 106          111

 21.2%¡Á25g     x

 x  =  5.55g               ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­ 2·Ö

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