NAME the compound which contains 0.463 g Tl, 0.241 g of chlorine, and 0.109 g of

Question

NAME the compound which contains 0.463 g Tl, 0.241 g of chlorine, and 0.109 g of oxygen by finding its molecular formula. The molar mass of the compound is 358.74 g/mol.

2. A certain sample of coal contains 1.6 % sulfur by mass. When coal is burned, the sulfur is converted to sulfur dioxide. To prevent air pollution, this sulfur dioxide is treated with calcium oxide to form calcium sulfite.

a. Calculate the daily mass (in metric tons, 1 metric ton = 1000 kg) of calcium oxide needed by a power plant that uses 6.60 x 106 kg of coal per day.

b. If the power plant has the two options below to purchase calcium oxide, which supplier should they use? Justify your answer.

Black’s Supply Co. $80/metric ton 99% purity Riley’s Discount Supply $70/metric ton 95% purity

Explanation / Answer

NAME the compound which contains 0.463 g Tl, 0.241 g of chlorine, and 0.109 g of oxygen by finding its molecular formula. The molar mass of the compound is 358.74 g/mol.

mol of Tl = 0.463/204.3833 = 0.0022653

mol of Cl = 0.241/35 = 0.006885

mol of O = mass/MW = 0.109/16 = 0.006812

ratio:

0.006812/0.0022653 = 3 O per Tl

0.006885:0.006885 = 1 O per 1 Cl

so

TlCl3O3

MW = 204.3833 +3*35 + 16*3 =357.3833 g/mol

so this is the final formula

TlCl3O3

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