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The pressure of the helium in the balloon is 100 000 Pa. The volume of the balloon is 0.030 m3 . The balloon is compressed at a constant temperature causing the volume to decrease to 0.025 m3 . No helium leaves the balloon. Calculate the new pressure in the balloon
The temperature of the helium in the balloon was increased. The mass and volume of helium in the balloon remained constant. Explain why the pressure exerted by the helium inside the balloon would increase
. A bicycle tyre has a volume of 1.2 x 10-3 m3 when fully inflated. The barrel of the pump
has a working volume of 9 x 10-5 m3. Assume that the inflation takes place slowly and
no heating occurs.
How many strokes of the pump are required to inflate the tyre from being completely
flat (no air inside) to its fully inflated pressure (3.0 x 105 Pa) and volume?
Why will the bicycle pump get hot if you’re pumping quickly?
Neon is a monatomic gas, in which inter-molecular forces are extremely weak. 1.00 kg
of neon gas has a density of 0.828 kgm-3 at 100 kPa and 293 K. Find the :
(a) average kinetic energy of each gas molecule
(b) total kinetic energy of the gas.
(c) Root-mean-square speed (crms)
If the neon gas is compressed to double its density, while keeping the temperature the
same:
(d) What are the values for (a)-(c) at the new pressure and volume?
80.0 cm3 of hydrogen is collected during a chemistry experiment at 20.0°C and 101 kPa.
What is its volume at IUPAC stp
A steel thick-walled gas cylinder used for storing compressed air is fitted with a safety
valve which triggers at a pressure of 1.0 x 106 Pa. The cylinder contains air at 17°C and
0.8x106 Pa. At what temperature will the safety valve trigger?
2. The density of hydrogen gas at 0°C and IUPAC standard pressure (100 kPa) is 9.00 g/m3.
a) If 1g of hydrogen gas is heated to 200°C in frictionless cylinder, find the volume it
occupies.
b) State what effect friction would have on your answer to (a).
A glass U-tube of uniform cross-sectional area is sealed at one end.
The air in the tube is initially at IUPAC standard atmospheric
pressure (100 kPa) when water is poured into the tube sealing the
U-tube and compressing the gas trapped in the sealed end.
a) If the difference in the water levels between the two sides of
the tube is x = 50.0 cm, what is the pressure of the air in the
sealed end of the tube. The density of water is 1000 kgm-3.
b) If the length of the air in the sealed end of the tube is 20.0 cm,
what pressure would be required to reduce this to 5.00 cm?
What would the value of x be to apply this pressure?
The cylinder of a pump has a volume of 25.0 cm3. It is connected to a container of
volume 225 cm3, containing air at atmospheric pressure (100 kPa). The pump draws air
from the atmospheric and pumps it into the container. Assume that the pump stroke is
slow and therefore the temperature of the air in the container remains constant.
Calculate the pressure of the air in the flask after one stroke of the pump adds more air.
A mass of gas occupies 200 cm3 at a temperature of 27.0°C and a pressure of 100 kPa.
Calculate the volume when:
a) The pressure is doubled at constant temperature
b) The absolute temperature is doubled at constant pressure
c) The pressure is increased to 150 kPa and the temperature is 127°C.
