An electrode of solid chromium is immersed in a 1M solution of Cr^3+; In a secon

Question

An electrode of solid chromium is immersed in a 1M solution of Cr^3+; In a second beaker, a tin electrode is immersed in a 1 M solution of Sn^2+. The two electrodes are connected by a wire through a voltmeter, and the two beakers are connected via a salt bridge. The entire system is maintained at a T = 298K. When the connection is made between the two cells, what is the E degree for the cell, in volts, if the reduction potential for Cr(III) to Cr(0) is -0.74 V and the reduction potential for Sn(II) to Sn(0) is -0.14V? (a) -0.78V (b) 0.78V (c) -0.60V (d)0.60V (e) none of these

Explanation / Answer

2 Cr -----------2Cr+3 + 6e-    E0 = 0.74V

3Sn+2 + 6e---------> 3Sn      E0 = -0.14V

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2Cr(s) + 3Sn+2 (aq) ---------> 2Cr+3 (aq) + 3Sn(s)                        E0Cell = 0.6V

answer d 0.60V

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