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 halft*i9ltm,2v:j 3 ffgdh reactions, how many moles of electrons are tr.a6 c y:9)cac)hns nnwansferred in the equation for the oxidation of ethanol in the presenc6s hna:cw.a)cycn n9)e 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 bebl.jhr16 8 kype 7la6r the same, the first equation 6e1bjkp78r y6l halr.must be multiplied by 2 and the second by 3. This gives a total of 12 electrons transferred.
| 
