Liquid hexane (bp = 69°C) is placed in a closed container at room temperature. A
ID: 975464 • Letter: L
Question
Liquid hexane (bp = 69°C) is placed in a closed container at room temperature. At first, the pressure of the vapor phase increases, but after a short time, it stops changing. Which statement does not explain this behavior?
At first, the evaporation of liquid molecules from the surface predominates, increasing the number of gas molecules and hence the vapor pressure.
As more molecules enter the gas phase, the probability of a gas molecule hitting the surface of the liquid and “sticking” increases, increasing the rate of condensation.
As more molecules enter the gas phase, the probability of a gas molecule hitting the surface of the liquid and “sticking” decreases, decreasing the rate of condensation.
When the rate of evaporation equals the rate of condensation, the vapor pressure becomes constant.
all these explain the behavior
a.At first, the evaporation of liquid molecules from the surface predominates, increasing the number of gas molecules and hence the vapor pressure.
b.As more molecules enter the gas phase, the probability of a gas molecule hitting the surface of the liquid and “sticking” increases, increasing the rate of condensation.
c.As more molecules enter the gas phase, the probability of a gas molecule hitting the surface of the liquid and “sticking” decreases, decreasing the rate of condensation.
d.When the rate of evaporation equals the rate of condensation, the vapor pressure becomes constant.
e.all these explain the behavior
Explanation / Answer
ANSWER C.
As more molecules enter the gas phase, the probability of a gas molecule hitting the surface of the liquid and “sticking” decreases, decreasing the rate of condensation.
c.As more molecules enter the gas phase, the probability of a gas molecule hitting the surface of the liquid and “sticking” decreases, decreasing the rate of condensation.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.