本题目来源于试卷: Mechanisms of Chemical Change F.2 Electron Transfer Reactions，类别为 IB化学
[单选题]
Using the following ;: 0-j5ig yk+xfuw nm6d uepu-half reactions,qq/;c3zb s/vkll fw70 how many moles of electrons are transferred in the equation for theb w ;zq7v3cls/0k qf/l oxidation of ethanol in the presence of acidified potassium dichromate when balanced with whole numbers?
$Cr_2O_7^{2-}(aq) + 14H^+(aq) +6e^- \rightarrow 2Cr^{3+}(aq) + 7H_2O(I)$
$CH_3CH_2OH(aq) + H_2O(I) \rightarrow CH_3COOH(aq) + 4H^+(aq) + 4e^-$
A. 2
B. 4
C. 6
D. 12
参考答案: D
本题详细解析:
For the number of electrons in the two half equations to be the same, the first bbj+ m (ucou 8ce 1)pn/p;(sfdequation must bu;( nbm/bc+8upos)1j pf c d(ee multiplied by 2 and the second by 3. This gives a total of 12 electrons transferred.
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