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 half reactionyt8z* h9 ff/ias t1el9x(3osw s, how many moles of el o ixb,nojh.qa:h7-i,+ ei n7 y5tz0oaectrons are transferred in the equation for the oxidation of ethanol in hxi70.- o,t5aeba,o nq: y oniji+z7h 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,uvb1/ o sp(pwz;o u8g( the first equation must be multiplied by 2 and the second by 3. This gives a total of 12 electrons v ( sbp(/8owguop1 ;zutransferred.
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