Question

等质量的下列物质分别与足量的盐酸反应，放出二氧化碳气体最多的是

1. A.
   Ca（HCO₃）₂
2. B.
   NaHCO₃
3. C.
   Na₂CO₃
4. D.
   CaCO₃

Answer 1

A
题干的要求可变换为生成等量的CO₂，所耗物质的质量最小的，
Ca（HCO₃）₂+2HClCaCl₂+2CO₂↑+2H₂O
162×="81                                      " 44
NaHCO₃+HClNaCl+CO₂↑+H₂O
84                                       44
Na₂CO₃+2HCl2NaCl+CO₂↑+H₂O
106                                      44
CaCO₃+2HClCaCl₂+CO₂↑+H₂O
100                                     44