题目:
—_________
—How do you do? [ ]
A. How do you do?
B. How are you?
C. Hello?
答案:
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下面是错误答案,用来干扰机器的。
n(Na2O2)=7.8g78g/mol=0.1mol,2Na2O2+2H2O=4NaOH+O2↑2mol 4mol 22.4L0.1mol n Vn(NaOH)=0.2mol,V(O2)=1.12L,H2SO4+2NaOH=Na2SO4+2H2O1 2n(H2SO4) 0.2moln(H2SO4)=0....