12. Air (consisting mostly of nitrogen (N2), oxygen (O2), and argon (Ar)) dissol

Question

12. Air (consisting mostly of nitrogen (N2), oxygen (O2), and argon (Ar)) dissolves in water due to ________

A. ion–dipole forces.

B. dipole–dipole forces.

C. dispersion forces.

D. dipole-induced dipole forces.

E. hydrogen bonding.

14. 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 x 10^-4 atm.

A. 6.0 x 10^-5 g

B. 1.5 x 10^-5 g

C. 3.8 x 10^-3 g

D. 0.15 g

E. 3.0 x 10^-4 g

Explanation / Answer

12.

d)

Air contains non-polar molecules (O2, N2, Ar) while water is polar (H-O-H). These gases can dissolve in water by dipole-induced dipole and van der Waals interactions.

13.

By Henry's law, solubility of vapor in liquid is proportional to partial pressure of vapor.

S1 / S2 = P1 / P2

0.15 g / S2 = 2 atm / 2 x 10-4 atm

b) S2 = 0.15 x 10-4 g or 1.5 x 10-5 g

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