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Chapter 4: 16 CYL (page 210)
A 0.00215g sample of polystyrene, a polymer composed of carbon and hydrogen, produced 0.00726g of CO2 0.00148g of H2O in combustion analysis. What is the empirical formula for polystyrene?
- CH is the empirical formula for polystyrene.
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A novel process for obtaining magnesium from sea water involves several reactions. Write a balanced chemical equation for each step of the process.
(a)The first step is the decomposition of solid calcium carbonate from seashells to form solid calcium oxide and gaseous carbon dioxide.
(b)The second step is the formation of solid calcium hydroxide as the only product from the reaction of the solid calcium oxide with liquid water.
(c)Solid calcium hydroxide is the added to the sea water, reacting with dissolved magnesium chloride to yield solid magnesium hydroxide and aqueous calcium chloride
(d)The solid magnesium hydroxide is added to a hydrochloric acid solution, producing dissolved magnesium chloride and liquid water.
(e)Finally, the magnesium chloride is melted and electrolyzed to yield liquid magnesium metal and diatomic chlorine gas.
What is the limiting reactant when 1.50 g of lithium and 1.50 g of nitrogen combine to form lithium nitride, a component of advanced batteries, according to the following unbalanced equation?\(Li + {N_2} \to L{i_3}N\).
Which solution could be used to precipitate barium ion Ba2+, in a water sample, Sodium chloride, sodium hydroxide, or sodium sulfate. What is the formula for the expected precipitate?
How many molecules of the sweetener saccharin can be prepared from 30 C atoms, 25 H atoms, 12 O atoms, 8 S atoms, and 14 N atoms?
Sodium bicarbonate (baking soda), NaHCO3, can be purified by dissolving it in hot water (60掳C), filtering to remove insoluble impurities, cooling to 0 掳C to precipitate solid NaHCO3 , and then filtering to remove the solid, leaving soluble impurities in solution. Any NaHCO3 that remains in solution is not recovered. The solubility of NaHCO3 in hot water of 60 掳C is 164 g/L. Its solubility in cold water of 0 掳C is 69 g/L. What is the percent yield of NaHCO3 when it is purified by this method?
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