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At 25°C, gas in a rigid cylinder with a movable piston has a volume of 145 mL and a pressure of 125 kPa. Then the gas is compressed to a volume of 80. mL. What is the new pressure of the gas if the temperature is held at 25°C?*
A 220.0-mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample?*
A sample of chlorine gas is at 300. K and 1.00 atmosphere. At which temperature and pressure would the sample behave more like an ideal gas?*
When a sample of a gas is heated in a sealed, rigid container from 200. K to 400. K, the pressure exerted by the gas is*
Under which conditions of temperature and pressure does a real gas behave most like an ideal gas?*
A rigid cylinder with a movable piston contains a sample of gas. At 300. K, this sample has a pressure of 240. kilopascals and a volume of 70.0 milliliters. What is the volume of this sample when the temperature is changed to 150. K and the pressure is changed to 160. kilopascals?*
A rigid cylinder with a movable piston contains a sample of hydrogen gas. At 330. K, this sample has a pressure of 150. kPa and a volume of 3.50 L. What is the volume of this sample at STP?*
Which unit is used to express the pressure of a gas?*
A sample of helium gas is in a sealed, rigid container. What occurs as the temperature of the sample is increased?*
Base your answers to questions 10 on the information below and on your knowledge of chemistry.
The diagram below represents a cylinder with a movable piston. The cylinder contains 1.0 liter of oxygen gas at STP. The movable piston in the cylinder is pushed downward at constant temperature until the volume of O2(g) is 0.50 liter.
Determine the new pressure of O2(g) in the cylinder, in atmospheres.*
Base your answers to questions 11 on the information below and on your knowledge of chemistry.
The diagram and data below represent a gas and the conditions of pressure, volume, and temperature of the gas in a rigid cylinder with a moveable piston.
Determine the volume of the gas in the cylinder at STP.*
Base your answers to questions 12 on the information below and on your knowledge of chemistry.
A bubble of air at the bottom of a lake rises to the surface of the lake. Data for the air inside the bubble at the bottom of the lake and at the surface of the lake are listed in the table below.
State the number of significant figures used to express the pressure at the surface of the lake.*
Base your answers to questions 13 on the information below and on your knowledge of chemistry.
In a laboratory activity, the volume of helium gas in a rigid cylinder with a movable piston is varied by changing the temperature of the gas. The activity is done at a constant pressure of 100. kPa. Data from the activity are plotted on the graph below.
Determine the temperature of the He(g) at a volume of 15.0 mL.*
Base your answers to questions 14 on the information below.
At standard pressure, hydrogen peroxide, H2O2, melts at −0.4°C, boils at 151°C, and is very soluble in water. A bottle of aqueous hydrogen peroxide, H2O2(aq), purchased from a pharmacy has a pressure-releasing cap. Aqueous hydrogen peroxide decomposes at room temperature, as represented by the balanced equation below.
2H2O2(aq) → 2H2O(ℓ) + O2(g) + 196.0 kJ
Explain why a hydrogen peroxide bottle needs a pressure-releasing cap.*
Base your answers to questions 15 on the information below and on your knowledge of chemistry.
Cylinder A has a movable piston and contains hydrogen gas. An identical cylinder, B, contains methane gas. The diagram below represents these cylinders and the conditions of pressure, volume, and temperature of the gas in each cylinder.
State a change in temperature and a change in pressure that will cause the gas in cylinder A to behave more like an ideal gas.*
