Problems A
167
By squaring both sides we get
W 2 = 12°
8
mole
PROBLEMS
1. A graduated tube, sealed at the upper end, has a mercury-filled leveling bulb
connected to the lower end. The gas volume is 25.0 ml when the mercury level
is the same ii, both tubes. The barometric pressure is 732 torr. What is the
volume when the level on the open side is 10.0 cm above the level of the
closed side?
2. If a barometer were filled with a liquid of density 1.60 g/ml, what would be the
reading when the mercury barometer read 730 torr? The density of mercury is
13.56 g/ml.
3. A mercury barometer reading of 728.3 mm is obtained at 23°C with a brass
scale. What is the barometer reading "corrected to 0°C"—that is, in torr?
4. What is the atmospheric pressure in lbs/in- when the barometer reading is 720
torr?
5. A student collects 265 ml of a gas over Hg at 25°C and 750 torr. What is the
volume at standard conditions?
6. What is the volume at room conditions (740 torr and 25°C) of 750 ml of a gas at
standard conditions?
7. A sealed vessel containing methane, CH 4 , at 730 torr and 27
D C is put into a box
cooled with "dry ice" ( —78°C). What pressure will the CH 4 exert under these
conditions?
8. Liquid nitrogen (boiling point, - 195.8°C) is commonly used as a cooling
agent. A vessel containing helium at 10 lb/in
2 at the temperature of boiling
water is sealed off and then cooled with boiling liquid nitrogen. What will be
its pressure expressed in torr?
9. Two liters of N 2 at 1.0 atm, 5.0 liters of H 2 at 5.0 atm, and 3.0 liters of CH 4 at
2.0 atm are mixed and transferred to a 10.0 liter vessel. What is the resulting
10. A low pressure easily achieved with a diffusion pump and a mechanical vacuum pump is 1.00 x 10~
fi torr. Calculate the number of molecules still present
in 1.00 ml of gas at this pressure and at 0
Q C.
11. A sample of nitrous oxide is collected over water at 24
C C and 735 torr. The
volume is 235 ml. What is the volume at standard conditions?
167
By squaring both sides we get
W 2 = 12°
8
mole
PROBLEMS
1. A graduated tube, sealed at the upper end, has a mercury-filled leveling bulb
connected to the lower end. The gas volume is 25.0 ml when the mercury level
is the same ii, both tubes. The barometric pressure is 732 torr. What is the
volume when the level on the open side is 10.0 cm above the level of the
closed side?
2. If a barometer were filled with a liquid of density 1.60 g/ml, what would be the
reading when the mercury barometer read 730 torr? The density of mercury is
13.56 g/ml.
3. A mercury barometer reading of 728.3 mm is obtained at 23°C with a brass
scale. What is the barometer reading "corrected to 0°C"—that is, in torr?
4. What is the atmospheric pressure in lbs/in- when the barometer reading is 720
torr?
5. A student collects 265 ml of a gas over Hg at 25°C and 750 torr. What is the
volume at standard conditions?
6. What is the volume at room conditions (740 torr and 25°C) of 750 ml of a gas at
standard conditions?
7. A sealed vessel containing methane, CH 4 , at 730 torr and 27
D C is put into a box
cooled with "dry ice" ( —78°C). What pressure will the CH 4 exert under these
conditions?
8. Liquid nitrogen (boiling point, - 195.8°C) is commonly used as a cooling
agent. A vessel containing helium at 10 lb/in
2 at the temperature of boiling
water is sealed off and then cooled with boiling liquid nitrogen. What will be
its pressure expressed in torr?
9. Two liters of N 2 at 1.0 atm, 5.0 liters of H 2 at 5.0 atm, and 3.0 liters of CH 4 at
2.0 atm are mixed and transferred to a 10.0 liter vessel. What is the resulting
10. A low pressure easily achieved with a diffusion pump and a mechanical vacuum pump is 1.00 x 10~
fi torr. Calculate the number of molecules still present
in 1.00 ml of gas at this pressure and at 0
Q C.
11. A sample of nitrous oxide is collected over water at 24
C C and 735 torr. The
volume is 235 ml. What is the volume at standard conditions?