Chemisty Q.?

1)How many minutes are needed to plate out 14.80 g Mg from molten MgCl2 using 3.70 A current?

2)Consider the voltaic cell , which is based on the following cell reaction.
Zn(s) + Cu2+(aq) Zn2+(aq) +Cu(s)

Under standard conditions, what is the maximum electrical work, in kilojoules, that the cell can accomplish if 57.7 g of copper are plated out?



3)What mass of calcium can be produced by this process if a current of 6.9 103 A is applied for 45 hr?

4)Assume that the electrolytic cell is 53% efficient. What is the total energy requirement for this electrolysis if the applied emf is +2.90 V?


5)The element indium is to be obtained by electrolysis of a molten halide of the element. Passing a current of 3.36 A for a period of 40.0 min results in formation of 3.176 g of In. What is the oxidation state of indium in the halide melt?

Answer:
1. 12 min
2. 320 kJ
3. 546 g
4. ---
5. +2

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