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BondingMCQ

Questions 14-17 refer to the following information. Substance | Lewis Diagram | Boiling Point CH3OH — Bonding Chemistry Question

Question

Questions 14-17 refer to the following information.

Substance | Lewis Diagram | Boiling Point
CH3OH | [VISUAL] | 338 K
C2H5OH | [VISUAL] | 351 K

Equimolar samples of CH3OH(l) and C2H5OH(l) are placed in separate, previously evacuated, rigid 2.0 L vessels. Each vessel is attached to a pressure gauge, and the temperatures are kept at 300 K. In both vessels, liquid is observed to remain present at the bottom of the container at all times. The change in pressure inside the vessel containing CH3OH(l) is shown below.

[VISUAL]

  1. Compared to the equilibrium vapor pressure of CH3OH(l) at 300 K, the equilibrium vapor pressure of C2H5OH(l) at 300 K is
A.

the same, because both compounds have hydrogen bonding among their molecules

B.

higher, because London dispersion forces among C2H5OH molecules are greater than those among CH3OH molecules

C.

lower, because London dispersion forces among C2H5OH molecules are greater than those among CH3OH molecules

✓ Correct
D.

lower, because of the larger number of hydrogen bonds among C2H5OH molecules

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