The vapor pressure of liquid octane, CHis is 40.0 mm Hg at 318 K A sample of CHi
ID: 1041255 • Letter: T
Question
The vapor pressure of liquid octane, CHis is 40.0 mm Hg at 318 K A sample of CHis is placed in a closed, evacuated container of constant volume at a temperature of 464 K. It is found that all of the CsHis is in the vapor phase and that the pressure is 64.0 mm Hg. If the temperature in the container is reduced to 318 K, which of the following statements are correct? Choose all that apply Only octane vapor will be present. ? Some of the vapor initially present will condense. O Liquid octane will be present. The pressure in the container will be 43.9 mm Hg. E No condensation will occur. Submit Answer Retry Entire Group 8 more group attempts remaining Previous 10:04Explanation / Answer
For the given system,
pressure is directly proportional to temperature
PV = nRT
therefore,
when the temperature is reduced,
- liquid octane will be present
Final pressure in the container = 40 mmHg x 318 K/464 K = 27.41 mmHg
which is lower than the vapor pressure of liquid octane. Thus all of octane would be in liquid phase.
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