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The Henry's law constant for O2 in water at 25 °C is given in Table 13.2. Which of the following is a reasonable constant when the temperature is 50 °C? Explain the reason for your choice.

(a) 6.7×10-4 mol/kg • bar

(b) 2.6×10-3 mol/kg • bar

(c) 1.3×10-3 mol/kg • bar

(d) 6.4×10-3 mol/kg • bar

Table 13.2 Henry's Law Constants for Gases in Water (25 °C)

Gas kH (mol/kg • bar)
He 3.8×10-4
H2 7.8×10-4
N2 6.0×10-4
O2 1.3×10-3
CO2 0.034
CH4 1.4×10-3
C2H6 1.9×10-3

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8 Dec 2020

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Related questions


Examine the Henry's law constants in the table below.

Table. Henry's Law Constants for Several Gases in Water at 25 ∘C

Gas kH (M/atm)
O2 1.3×10−3
N2 6.1×10−4
CO2 3.4×10−2
H2S 1.0×10−1
Ne 34.5×10−4

Why is the constant for hydrogen sulfide bigger than the others?

Why is the constant for hydrogen sulfide bigger than the others?

Hydrogen sulfide is the only compound on the list that is polar, so we would expect its solubility in water to be greater than those of the other gases.
The shape of a hydrogen sulfide molecule resembles that of a water molecule, so we would expect its solubility in water to be greater than those of the other gases.
Hydrogen sulfide decomposes when mixed with water.
Hydrogen sulfide molecules are bigger than molecules of other gases on the list. That is why the interaction between H2S and water molecules is very strong.

1.) Indicate which aqueous solution has the lowest vapor pressure:

a. 0.2 M MgCl2 b. 0.1 M MgCl2 c. 0.2 M NaCl d. 0.1 M KCl e. 0.1 M Na2CO3

2.) Indicate which aqueous solution has the fastest evaporation rate.

a. 0.2 M MgCl2 b. 0.1 M MgCl2 c. 0.2 M NaCl d. 0.1 M KCl e. 0.1 M Na2CO3

3.) What is the molarity of a sucrose (C12H22O11) solution that produces an osmotic pressure of 2.65 atm at 25°C?

a. 0.0349 M b. 0.108 M c. 0.127 M d. 0.398 M e. 0.0127 M

4.) The pressure of carbon dioxide in a beer bottle is about 2 atm. At this pressure about 0.15 g of carbon dioxide dissolves in 100 mL of beer. How much carbon dioxide remains dissolved in 100 mL after the bottle is opened? The partial pressure of carbon dioxide is 2.0 ´ 10-4 atm. a. 3.8 ´ 10-3 g b. 0.15 g c. 6.0 ´ 10-5 g d. 1.5 ´ 10-5 g e. 3.0 ´ 10-4 g

5.) Caryophyllene, a nonelectrolyte, is one of the compounds responsible for the flavor of cloves. A 207 mg sample of caryophyllene was dissolved in 1.00 g of chloroform (Kb = 3.63°C/m), increasing the boiling point of chloroform by 3.68°C. What is the molar mass of caryophyllene? a. 164 g/mol b. 219 g/mol c. 193 g/mol d. 204 g/mol e. 156 g/mol

6.) Which of the following would be most effective in melting ice on a sidewalk?

a. 1 kg KCl b. 1 kg CaCl2 c. 1 kg NaCl d. 1 kg MgCl2 e. 1 kg CuCl

7.) Given the same number of moles of each of the following substances, which one would be most effective in melting ice on a sidewalk?

a. KCl b. CaCl2 c. MgCl2 d. (NH4)3PO4 e. NaCl

8.) If water contains about 42 mg of oxygen per liter at 20°C and 1.0 atm, what would be the value of Henry's law constant for oxygen dissolving in water? The mole fraction of oxygen in air is 0.21.

a. 1.9 ´ 10-2 mol/(L atm) b. 6.3 ´ 10-3 mol/(L atm) c. 0.25 mol/(L atm) d. 0.010 mol/(L atm) e. 1.3 ´ 10-3 mol/(L atm)

9.) What is the molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL. a. 0.048 M b. 0.528 M c. 0.479 M d. 0.436 M e. 22.9 M

10.) Determine the molal concentration of a sugar solution in water that has a freezing point of -2.1°C. Kf = 1.86°C/m for water.

a. -1.13 m b. -3.91 m c. 1.13 m d. 0.113 m e. 3.91 m

11.) Eugenol is a nonelectrolyte that contributes to the flavor of spices such as clove, nutmeg, cinnamon, and basil. A 328 mg sample of eugenol was dissolved in 10.0 g of chloroform
(Kb = 3.63°C/m), increasing the boiling point of the chloroform by 0.726°C. What is the molar
mass of eugenol? a. 82 g/mol b. 164 g/mol c. 182 g/mol d. 363 g/mol e. 328 g/mol

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