The mole fraction of sodium chloride, NaCl, in a saturated aqueous solution is 0,220. (a) What is the molality (molal concentration) of this solution? (b) What is the molarity (molar concentration) of this solution if it has a density of 1,150 g.cm–3? (c) What is the mass percentage NaCl in the solution?
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The mole fraction of sodium chloride, NaCl, in a saturated aqueous solution is 0,220.
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(a) What is the molality (molal concentration) of this solution?
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(b) What is the molarity (molar concentration) of this solution if it has a density of 1,150 g.cm–3?
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(c) What is the mass percentage NaCl in the solution?
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Which of the following liquids are likely to be miscible with water: 1-propanol (CH3CH2CH2OH), carbon tetrachloride (CCl4), hexane (C6H14), and acetic acid (CH3CO2H)? Motivate your choice(s) using your knowledge of intermolecular forces.
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The vapor pressure of pure water at 45 °C is 71,9 mm Hg. What is the vapor pressure of a mixture of 21,0 g sucrose (C12H22O11, molar mass 342,3 g/mol) and 79,0 g water?
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What is the freezing point of a solution containing 4,78 grams naphthalene (molar mass = 128,2 g/mol) dissolved in 32,0 grams paradichlorobenzene? The freezing point of pure paradichlorobenzene is 53,0 °C and the freezing point depression constant, Kfp, is –7,10 °C/m.
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Describe how you would adjust the temperature if you wanted to increase the solubility of a gas in a liquid.
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Most fish have a very difficult time surviving in lakes that are at altitudes greater than 3500 m above sea level. How could Henry’s law be used to account for this fact?
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Toluene (C6H5CH3) and benzene (C6H6) are two organic liquids with very similar properties, and when they are mixed, they form an ideal solution. A mixture contains 35,6 g of toluene and 125 g of benzene. Toluene has a vapour pressure of 22 mm Hg, and benzene has a vapour pressure of 75 mm Hg at 25°C.
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(a) Which compound, toluene or benzene, would have the highest boiling point? Motivate your answer.
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(b) Calculate the total vapour pressure over the mixture at 25°C.
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The mole fraction of sodium chloride, NaCl, in a saturated aqueous solution is 0,220.
-
(a) What is the molality (molal concentration) of this solution?
-
(b) What is the molarity (molar concentration) of this solution if it has a density of 1,150 g.cm–3?
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(c) What is the mass percentage NaCl in the solution?
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Which of the following liquids are likely to be miscible with water: 1-propanol (CH3CH2CH2OH), carbon tetrachloride (CCl4), hexane (C6H14), and acetic acid (CH3CO2H)? Motivate your choice(s) using your knowledge of intermolecular forces.
-
The vapor pressure of pure water at 45 °C is 71,9 mm Hg. What is the vapor pressure of a mixture of 21,0 g sucrose (C12H22O11, molar mass 342,3 g/mol) and 79,0 g water?
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What is the freezing point of a solution containing 4,78 grams naphthalene (molar mass = 128,2 g/mol) dissolved in 32,0 grams paradichlorobenzene? The freezing point of pure paradichlorobenzene is 53,0 °C and the freezing point depression constant, Kfp, is –7,10 °C/m.
-
Describe how you would adjust the temperature if you wanted to increase the solubility of a gas in a liquid.
-
Most fish have a very difficult time surviving in lakes that are at altitudes greater than 3500 m above sea level. How could Henry’s law be used to account for this fact?
-
Toluene (C6H5CH3) and benzene (C6H6) are two organic liquids with very similar properties, and when they are mixed, they form an ideal solution. A mixture contains 35,6 g of toluene and 125 g of benzene. Toluene has a vapour pressure of 22 mm Hg, and benzene has a vapour pressure of 75 mm Hg at 25°C.
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(a) Which compound, toluene or benzene, would have the highest boiling point? Motivate your answer.
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(b) Calculate the total vapour pressure over the mixture at 25°C.
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