The vapor pressure of liquid hexane, C6H14, is 40.0 mm Hg at 271 K. A sample of C6H14 is placed in a closed, evacuated container of constant volume at a temperature of 401 K. It is found that all of the C6H14 is in the vapor phase and that the pressure is 67.0 mm Hg. If the temperature in the container is reduced to 271 K, which of the following statements are correct? a. Some of the vapor initially present will condense.
b. Liquid hexane will be present.
c. No condensation will occur.
d. The pressure in the container will be 100. mm Hg.
e. Only hexane vapor will be present

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

the awnser is group 12