1. A voltaic cell consists of two half-cells. One of the half-cells contains a platinum electrode surroundedby chromium (III) and dichromate ions. The other half-cell contains a platinum electrode surrounded bybromate ions and liquid bromine. Assume that the cell reaction, which produces a positive voltage,involves both chromium (III) and bromate ions. The cell is at 25°C. Information for the bromate reductionhalf reaction is as follows:2BrО, (ag) + 12Hн (ад) + 10е-Br2(1) + 6H,0Eed = 1.478 V(a) Write the cell diagram notation(b) Calculate E° for the cell(c) Calculate the voltage of the cell when all ionic species except H+ are 0.1500M and the pH is at -0.301.2. Consider a voltaic cell at 25°C in which the following reaction takes place.30,g) + 4NO(g) + 2H;0 → 4NO, (aq) + 4H* (aq)(a) Calculate E° for the cell(b) Calculate E under the following conditions: [NO:] = 0.750 M, PNo = 0.993 atm, Po, = 0.515 atm, pH =2.85.3. A metallurgist wants to goldplate a thin sheet with the following dimensions: 1.5 in. x 8.5 in. x 0.0012in. The gold plating must be 0.0020 in. thick.(a) How many grams of gold (p = 19.3 g/cm³) are required?(b) How long will it take to place the sheet from AUCN using a current of 7.00 A? Assume 85% efficiency.

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1. A voltaic cell consists of two half-cells. One of the half-cells contains a platinum electrode surrounded by chromium (II) and dichromate ions. The other half-cell contains a platinum electrode surrounded by

1. A voltaic cell consists of two half-cells. One of the half-cells contains a platinum electrode surrounded by chromium (II) and dichromate ions. The other half-cell contains a platinum electrode surrounded by

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

1. A voltaic cell consists of two half-cells. One of the half-cells contains a platinum electrode surrounded
by chromium (III) and dichromate ions. The other half-cell contains a platinum electrode surrounded by
bromate ions and liquid bromine. Assume that the cell reaction, which produces a positive voltage,
involves both chromium (III) and bromate ions. The cell is at 25°C. Information for the bromate reduction
half reaction is as follows:
2BrО, (ag) + 12Hн (ад) + 10е-
Br2(1) + 6H,0
Eed = 1.478 V
(a) Write the cell diagram notation
(b) Calculate E° for the cell
(c) Calculate the voltage of the cell when all ionic species except H+ are 0.1500M and the pH is at -0.301.
2. Consider a voltaic cell at 25°C in which the following reaction takes place.
30,g) + 4NO(g) + 2H;0 → 4NO, (aq) + 4H* (aq)
(a) Calculate E° for the cell
(b) Calculate E under the following conditions: [NO:] = 0.750 M, PNo = 0.993 atm, Po, = 0.515 atm, pH =
2.85.
3. A metallurgist wants to goldplate a thin sheet with the following dimensions: 1.5 in. x 8.5 in. x 0.0012
in. The gold plating must be 0.0020 in. thick.
(a) How many grams of gold (p = 19.3 g/cm³) are required?
(b) How long will it take to place the sheet from AUCN using a current of 7.00 A? Assume 85% efficiency.

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