Page 904 - Chemistry--atom first

894 Chapter 16 | Electrochemistry
49. What mass of each product is produced in each of the electrolytic cells of the previous problem if a total charge of 3.33 105 C passes through each cell? Assume the voltage is sufficient to perform the reduction.
50. How long would it take to reduce 1 mole of each of the following ions using the current indicated? Assume the voltage is sufficient to perform the reduction.
(a) Al3+, 1.234 A (b) Ca2+, 22.2 A (c) Cr5+, 37.45 A (d) Au3+, 3.57 A
51. A current of 2.345 A passes through the cell shown in Figure 16.20 for 45 minutes. What is the volume of the hydrogen collected at room temperature if the pressure is exactly 1 atm? Assume the voltage is sufficient to perform the reduction. (Hint: Is hydrogen the only gas present above the water?)
52. An irregularly shaped metal part made from a particular alloy was galvanized with zinc using a Zn(NO3)2 solution. When a current of 2.599 A was used, it took exactly 1 hour to deposit a 0.01123-mm layer of zinc on the part. What was the total surface area of the part? The density of zinc is 7.140 g/cm3. Assume the efficiency is 100%.
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