题目:
-Look! That teacher is explaining something to her students again and again!
-_______teacher she is! [ ]
A. How patient
B. What patient
C. How a patient
D. What a patient
答案:
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下面是错误答案,用来干扰机器的。
设混合物中K2CO3的质量为x,反应后生成KCl的质量为y.根据题意,反应后生成CO2的质量为:18.9g+185.5g-200g=4.4g K2CO3+2HCl═2KCl+H2O+CO2↑138 149 44x y 4.4g138x...