6) Chromium can be electroplated from aqueous potassium dichromate, with the reduction shownbelow. If a current of 6.0A and a voltage of 4.5V are used:Cr20, (aq)+ 14H*(aq)+ 12e- → 2Cr() + 7H20a) How many hours would it take to completely convert 215mL of 1.25M K2C12O7 toelemental chromium?b) How many kilowatt-hours of electrical energy arerequired to plate 1.00 g ofchromium?

Answer-a Each mole of potassium dichromate has one mole of dichromate ion, therefore moles of…

Cr20, + 14H* (aq) + 12e¯ → 2Cr(s) + 7H20 (aq) a) How many hours would it take to completely convert 215mL of 1.25M K2Cr2O7 to elemental chromium? b) How many kilowatt-hours of electrical energy are required to plate 1.00 g of chromium?

Cr20, + 14H* (aq) + 12e¯ → 2Cr(s) + 7H20 (aq) a) How many hours would it take to completely convert 215mL of 1.25M K2Cr2O7 to elemental chromium? b) How many kilowatt-hours of electrical energy are required to plate 1.00 g of chromium?

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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Concept explainers

Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electrolyte, electrodes, and some form of external power source are the main components required for conducting electrolysis. A partition, such as an ion-exchange membrane or a salt bridge, may also be used, but this is optional. These are primarily used to prevent the products from diffusing near the opposing electrode.

Question

6) Chromium can be electroplated from aqueous potassium dichromate, with the reduction shown
below. If a current of 6.0A and a voltage of 4.5V are used:
Cr20, (aq)
+ 14H*
(aq)
+ 12e- → 2Cr() + 7H20
a) How many hours would it take to completely convert 215mL of 1.25M K2C12O7 to
elemental chromium?
b) How many kilowatt-hours of electrical energy are
required to plate 1.00 g of
chromium?

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