CHAPTER 21 TAKE HOME QUIZ Multiple Choice Identify the choice that best complete
ID: 558299 • Letter: C
Question
CHAPTER 21 TAKE HOME QUIZ Multiple Choice Identify the choice that best completes the statement or answers the question. Which of the following statements regarding Faraday's Law of Electrolysis is false? a. The faraday is a quantitative unit of electricity b. One mole of electrons gained in reductio faraday of electricity c. One mole of electrons lost in oxidation is equivalent to one faraday of electricity d. One coulomb = 96,485 fradays. e. One ampere of current = One coulomb per second. n is equivalent to one 2. How many faradays (F) are passed through a cell if 6.25 amperes of current are passed through the cell for 1.50 hours? a, 4.19F b. 2.86 F c. 251 F d. 0.350 F e. 5.83 103 F 3. An aqueous copper(I) sulfate solution is electrolyzed for 45 minutes. A 3.2 ampere is current is used. What mass of copper is a. 0.95 g b. 1.9g c. 2.8g d. 4.6g e.5 4. Calculate the quantity of charge necessary to produce 10 liters of H (g) at STP from the electrolysis of water a. 8.6 0 10 coulombs b. 3.70 10 coulombs 104 coulombs d.5.3 104 coulombs e, 4.8 104 coulombs c. 1.70 5. How long would a constant current of 4.5 amperes be required to flow in order to plate out 15 g of chromium from a chromium(III) sulfate solution? a. 268 hr b. 309 hr c. 5.15 hr d. 23.2 hr e. 1.72 hr 6. A spoon is to be electroplated with gold using 1.0 M Au(NO,) and 2.57 A of current. How many minutes are required to deposit 5.50 grams of gold on the spoon? a. 17.5 minutes d. 135 minutes e. 0.266 minutes b. 52.4 minutes c. 3145 minutesExplanation / Answer
1)
only a is false
Faraday is unit of charge
So, this is wrong
rest all are correct
Answer: a
2)
t = 1.50 hr
= 1.50*3600 s
= 5400 s
Q = I*t
= 6.25 A * 5400 s
= 33750 C
Number of F = charge / charge of one Faraday
= 33750 / 96485
= 0.350 F
Answer: d
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