answer question 2b. showing all workings clearly. Suppose a chlor-alkali plant h

Question

answer question 2b. showing all workings clearly.

Suppose a chlor-alkali plant has 250 cells, through each of which a current of 100,000A passes continuously (a) Calculate the mass of chlorine that this plant can produce per 24-hours day (b) If the cell voltage is 3.5v, calculate the total electrical energy consumed by the plant in one 24-hour day, and express it, both in Joules and in kilowatt hour, calculate the cost for the needed electricity needed to run the plant for one 24 hour day (c) If electricity costs No.05 per kilowatt-hour, calculate the cost for the needed electricity needed to run the plant for one 24-hour day. d Describe with a good flow diagram the unit operation and chemical conversion in contact process for making sulfuric acid. e. Propose several ways in which prediction from Le chatelier's principle could be used to improve the yield of so from SO and air. 3(g) f. State five uses of sulfuric acid g. The world production of pure H2so4 in 1991 was 551 x 1010kg. Suppose that all locations converted sulfur to H2SO4 at 99.97% efficiency. What then, was the total mass of emitted sulfur dioxide (in kg) 2a. With the aid of flow diagram describe the unit operations and chemical conversion in wet-acid process of producing phosphoric acid. b. Suppose a fertilizer plant produces phosphoric acid through the wet acid and used it to make triple super phosphate fertilizer Write a balanced equation for the overall reaction. How many moles of gypsu are generated per moles of Ca(HzPO4)2 H20 c. Calculate the volume of steam produced when a 4.0kg brick made from pure is completely dehydrated at 6000c and a pressure of 1.0 atm. Eqn. of reaction is 3Alsio205(OH)4 A16 Si2013 4SiO2 20(g)

Explanation / Answer

Ans:

[I] In the wet process

1. Phosphoric acid is produced by chemical reaction of sulfuric acid with naturally occuring phosphate rock.

Ca5(PO4)3F + 5H2SO4 5CaSO4 + 3H3PO4 + HF

2. Triple super phoshpate fertiizer-TSP :- Phosphoric acid produced in the first step then reacts with the rock forming TSP.

Ca5(PO4)3F + 7H3PO4 + 5H2O 5Ca(H2PO4)2.H2O + HF

3. These two reactions can be combined to give the overall equation:

Ans: 2Ca5(PO4)3F + 7H2SO4 + 3H2O 7CaSO4 + 3Ca(H2PO4)2.H2O + 2HF

[II] How many moles of gypsum are generated per two moles of Ca(H2PO4)2.H2O

a) no.of moles of gypsum(CaSO4) = no.of moles of sulfuric acid(H2SO4)

b) Taking molar ratio from final reaction

2 moles of Ca(H2PO4)2.H2O x    7 moles CaSO4    = 4.67 moles CaSO4(gypsum)

3 moles Ca(H2PO4)2.H2O

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