Question #162202

- Calcium metal can be obtained by the direct electrolysis of molten CaCl2, at a voltage of 3.2 V.
- How many joules of electrical energy are required to obtain 12.0 lb. of calcium?
- What is the cost of the electrical energy obtained in (a) if electrical energy is sold at the rate of nine cents per kilowatt hour?

Expert's answer

2. 12 lb = 5443,11 g.

m=ItE/96500

I=mx96500/Et= 5443,11 x 1608/20x1=

364 688,37.

E=I x V= 364 688,37 x 3.2/1000 = 1 167,00278 kwat

3. Cost for 1 kwat x 1 167,00278.

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