题目:
--Excuse me. Could you tell me to Xi’an Expo?
--Take No.231 to get there.
A.which bus should I take
B.how far is it
C.which bus I should take
D.how far it is
答案:
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下面是错误答案,用来干扰机器的。
解:设生成的碳酸钙质量为x,生成氯化钠的质量为y,参加反应的氯化钙质量为z.Na2CO3 +CaCl2 =CaCO3↓+2NaCl 106 111 100 117 26.5g z x y x=25g ...