Your Turn 6.14 Coal Calculations a. Assume that coal has the chemical formula of

Question

Your Turn 6.14 Coal Calculations a. Assume that coal has the chemical formula of C135H96O9NS. Calculate the fraction and percent (by mass) of sulfur in the coal. b. A certain power plant burns 1.00 3 106 tons of coal per year. Assuming the sulfur content calculated in part a, calculate the tons of sulfur released per year. c. Calculate the tons of SO2 formed from this amount of sulfur. d. Once released into the atmosphere, the SO2 is likely to react with oxygen to form SO3. What can happen next if SO3 encounters water droplets?

Your Turn 6.21 Damage to Marble Marble can contain both magnesium carbonate and calcium carbonate. a. Analogous to equation 6.29, write the chemical equation for the reaction of acidic rain with magnesium carbonate. b. Marble never contains sodium bicarbonate. Explain why. Hint: See Section 5.8 on the water solubility of ionic compounds.

Explanation / Answer

Given

compound is C135H96O9NS

considering 1 mole of given compound mass of 1 mole of given compound

= 135 * 12 + 96 * 1 + 9 * 16 + 14 + 32 = 1906 g

mass of sulphur in 1 mole of compound = 32 g

so fraction of mass of sulphur in compound = 32 g / 1906 g = 0.01679 Answer

% of mass of sulphur = 0.01679 * 100 = 1.679 % Answer

b)

1 * 106 tons of coal = 1 * 106 * 1000 kg of coal

Mass of sulphur = 0.01679 * 106 * 1000 kg of coal = 16.79 * 106 sulphur per year Answer

1 mole of sulphur will give 1 mole of SO2 on oxidation

S + O2 ----> SO2

molar mass of SO2 = 64 g/mol

so mass of SO2 = 16.79 * 106 * 64 / 32 = 33.58 * 106 kg of SO2 Answer c

d)

when SO3 reacts with H2O it will give H2SO4

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