D) +0.35 cuso,() 12. Two electrolytic cells are connected in series so that the
ID: 1044435 • Letter: D
Question
D) +0.35 cuso,() 12. Two electrolytic cells are connected in series so that the same current flows . How through both cells for the same length of time. The amount of tin deposited is 0,01 mo much copper is deposited? A) 0.005 mol B) 0.01 mol C) 0.02 mol D) 0.05 mol 13. Which of the following expressions is correct for the maximum mass of copper, in grams, ectrolyzing aqueous CuCI2 for 16 hours at a constant that could be plated out by el current of 3.0 amperes? (1 faraday 96,500 coulombs) A) (16) (3600) (3,0) (63.55) (2) B) (16) (3600)(30) (63.55) (96,500) (96,500) (2) c) (16) (3600) (3.0) (63.55) D) (16) (60) (3,0) (96500) (63.55) (2) (96,500) -14. Consider the following reaction: Sn,, + Pbn--> Pb" + Sn®-The oxidation-reduction reaction above takes place in a galvanic cell. If the initial concen remains constant, what will be the effect on the reaction quotient Q and the cel potential, E? A) Q will increase and E will decrease. B) Q will decrease and E will increase. C) Q and E will increase. D) Q and E will decrease.Explanation / Answer
12.
According to second law of electrolysis,
W1 / W2 = E1 / E2
So, ((B) 0.01 mol of Cu can be deposited because the number of equivalents of Cu and SN are same as Cu and Sn carries +2 oxidation state only.
13.
According to First law of electrolysis,
W = M * c * t / (Z * F)
(B) W = 63.55 * 3.00 * 16 * ( 60 * 60 ) / ( 2 * 96500 )
14.
Applying Nernst equation,
Ecell = E0cell - ( 0.05916 / n ) * Log[Sn2+] / [Pb2+]
So, Ecell is inversely proportional to [Sn2+],
Increase in [Sn2+] will decrease the cell potential.
(A) Q will increase and E will decrease
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