Objective 9: Describe and perform calculations associated with electroplating and electrodeposition. 41. A current of 10

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Objective 9 Describe And Perform Calculations Associated With Electroplating And Electrodeposition 41 A Current Of 10 1 (101.56 KiB) Viewed 11 times

Objective 9: Describe and perform calculations associated with electroplating and electrodeposition. 41. A current of 10.7 amperes is run for 30.0 minutes through a cell whose reaction in the cathode is Cr³+ (aq) + 3e → Cr (s): a. How many coulombs of electricity pass through the cell? b. How many moles of electrons pass through the cell? c. How many moles of chromium are deposited? d. What is the mass of chromium in grams deposited? 42. Calculate the number of grams of copper metal that can be produced by supplying 1.0 mole of electrons (also referred to supplying 1.00 F) to a solution of Cu²+ ions. 43. Calculate the amounts of Cu and Br₂ produced in 1.0 h at inert electrodes in a solution of CuBr₂ by a current of 4.50 A. 44. A steady current was passed through molten COSO, until 2.35 g of metallic cobalt was produced. Calculate the number of coulombs of electricity used. 45. The passage of a current of 0.750 A for 25.0 min deposited 0.369 g of copper from a CuSO₁ solution. From this information, calculate the molar mass of copper. 46. A student wants to deposit 10.0 g of gold onto a ring from a solution of AuCl3. How long (in hours) must the student run a 0.750 A current to deposit the desired mass of Au? 47. Calculate the current required to plate out 25.0g of nickel from an aqueous solution of NiSO4 if the current runs for 6.00 hr. 48. An electroplating firm wishes to plate 14.5 g of Cu onto a pair of baby shoes from a Cu(NO3)2 solution. If a 2.45 A current is used, calculate the time required in hours. 49. In a certain electrolysis experiment, 1.44 g of Ag were deposited in one cell (containing an aqueous AgNO3 solution), while 0.120 g of an unknown metal X was deposited in another cell (containing an aqueous XCl3 solution) in series with the AgNO3 cell. Calculate the molar mass of X. 62