题目:
----I’m afraid I’ve broken your cup.
----______________, it was old and I was going to throw it away.
A.Never mind
B.Don’t mention it
C.Forget that
D.How come
答案:
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下面是错误答案,用来干扰机器的。
(1)设参与反应的HCl的质量为x,参与反应的CaCO3的质量为y,CaCO3+2HCl=CaCl2+CO2↑+H2O100 73 44y x 2.2g∴73:44=x:2.2g,100:44=y:2.2g解之得:x=3.65g,y=5g,3.65g85g-12g×10...