13th Edition

ISBN: 9781259911156

Author: Raymond Chang Dr., Jason Overby Professor

Publisher: McGraw-Hill Education

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Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to a…

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Chapter 12, Problem 12.124QP

Certain fishes in the Antarctic Ocean swim in water at about −2°C. (a) To prevent their blood from freezing, what must be the concentration (in molality) of the blood? Is this a reasonable physiological concentration? (b) In recent years scientists have discovered a special type of protein in these fishes’ blood which, although present in quite low concentrations (≤ 0.001 m), has the ability to prevent the blood from freezing. Suggest a mechanism for its action.

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Chapter 12, Problem 12.123QP

Chapter 12, Problem 12.125QP

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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? (c) What is the mass percentage NaCl in the solution? 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? 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.…

(a) Suppose that you add 25.6 g of an unknown molecular compound to 0.250 kg of benzene, which has a Kf of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 2.64 oC compared to pure benzene. What is the molar mass (in g/mol) of the unknown compound? (b) What is the freezing point (in degrees Celcius) of 3.77 kg of water if it contains 170.1 g of CaBr2 ? The freezing point depression constant for water is 1.86 oC/m and the molar mass of CaBr2 is 199.89 g/mol. (c) What mass, in grams, of NaCl needs to be added to 1.6 kg of water in order to create a solution with a freezing point of -6.0 °C? The freezing point depression constant of water is 1.86 ºC/m. (d) What mass, in grams, of NaCl needs to be added to 1.6 kg of water in order to create a solution with a freezing point of -6.0 °C? The freezing point depression constant of water is 1.86 ºC/m.

Chapter 12 Solutions

Chemistry

Ch. 12.2 - Prob. 1PE Ch. 12.2 - Prob. 1RCF Ch. 12.2 - What is the strongest type of intermolecular force...Ch. 12.3 - Prob. 2PE Ch. 12.3 - Prob. 3PE Ch. 12.3 - Prob. 4PE Ch. 12.3 - Prob. 5PE Ch. 12.3 - A solution is prepared at 20C and its...Ch. 12.3 - Determine the percent composition by mass of LiCl...Ch. 12.3 - Prob. 3RCF

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Solution Summary: The author explains how the concentration of blood in fish must be calculated to prevent the blood from freezing. Molality is defined as number of moles of the solute present in the kilogram of solvent.

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