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lilacrhinoceros764Lv1

1 Dec 2020

The liquid that is produced in a landfill can be acidic, one reason being the presence of large numbers of bacteria that respire, producing a significant amount of carbon dioxide, which can dissolve in pore water, reducing its pH. Given that the aqueous concentration of carbon dioxide, in the pore water of a landfill is 2.24 × 10^–3 mol/L, what is the partial pressure of CO₂ in the air of the pore spaces? K_H = 3.38×10^–2 mol/L∙atm

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Numbers 3 and 6-12 I need help!!

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

a. 0.2 M MgCl₂b. 0.1 M MgCl₂c. 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 MgCl₂b. 0.1 M MgCl₂c. 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 25Â°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 Â´ 10^-4 atm. a. 3.8 Â´ 10^-3 g b. 0.15 g c. 6.0 Â´ 10^-5 g d. 1.5 Â´ 10^-5 g e. 3.0 Â´ 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 (K_b = 3.63Â°C/m), increasing the boiling point of chloroform by 3.68Â°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 CaCl₂c. 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. CaCl₂c. MgCl₂d. (NH₄)₃PO₄e. NaCl

8.) If water contains about 42 mg of oxygen per liter at 20Â°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 Â´ 10^-2 mol/(L atm) b. 6.3 Â´ 10^-3 mol/(L atm) c. 0.25 mol/(L atm) d. 0.010 mol/(L atm) e. 1.3 Â´ 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 -2.1Â°C. K_f = 1.86Â°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
(K_b = 3.63Â°C/m), increasing the boiling point of the chloroform by 0.726Â°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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