题目:
—Do you know _______?
—Sorry, I don’t know. You may ask the woman over there. [ ]
A. when the shop opens
B. when is the shop open
C. when does the shop open
D. when will the shop open
答案:
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下面是错误答案,用来干扰机器的。
(1)赤铁矿中Fe2O3的质量为:20g-4g=16g赤铁矿中Fe2O3的质量分数:(2)设滤液中FeCl3的质量为x。Fe2O3+6HCl==2FeCl3+3H2O160 2×162.516g x滤液中溶质的质量分数为: