1. A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?
A) > 50.0 torr
B) 50.0 torr
C) 25.0 torr
D) The mass of the octane vapor is needed to calculate the vapor pressure.
E) The external pressure is needed to calculate the vapor pressure.
2. The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true?
A) Solid xenon has a higher density than liquid xenon.
B) Solid xenon has the same density as liquid xenon.
C) The phase diagram cannot be used to predict which phase of xenon is denser.
D) Freezing xenon is an endothermic process.
E) None of these statements is true.
1. A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?
A) > 50.0 torr
B) 50.0 torr
C) 25.0 torr
D) The mass of the octane vapor is needed to calculate the vapor pressure.
E) The external pressure is needed to calculate the vapor pressure.
2. The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true?
A) Solid xenon has a higher density than liquid xenon.
B) Solid xenon has the same density as liquid xenon.
C) The phase diagram cannot be used to predict which phase of xenon is denser.
D) Freezing xenon is an endothermic process.
E) None of these statements is true.
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