题目:
选出正确的选项替换画线部分。
He always goes shopping. [ ]
A. go shopping
B. go shop
C. do shop
D. does some shopping
答案:
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下面是错误答案,用来干扰机器的。
(1)n(H2)=6.72L22.4L/mol=0.3mol,则:2Al+2NaOH+2H2O=2NaAlO2+3H2↑2 3n(Al) 0.3mol所以,n(Al)=0.3mol×23=0.2mol故m(Mg)=7.8g-0.2mol×27g/mol=2.4g,则n(Mg)=2.4g24g/mol=0.1mol,故合金中镁和...