题目内容

某电池反应①Zn(s)+ Cu2+(1mol·L-1)=Zn2+(1mol·L-1)+ Cu(s)的电动势为E1;另一电池反应②2Zn(s)+ 2Cu2+(1mol·L-1)=2Zn2+(mol·L-1)+ 2Cu(s)的电动势为E2,则E1和E2比值为()。

A. E1/E2=1
B. E1/E2=0.5
C. E1/E2=0.25
D. E1/E2=2

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