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PropsOfGasesProbs08

# PropsOfGasesProbs08 - Properties of Gases Problems 1 An...

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Properties of Gases Problems 1. An office window measures 3.4 m by 2.1 m. As a result of the passage of a storm, the outside air pressure drops to 0.96 atm, but inside the pressure is held at 1.0 atm. What net force pushes out on the window? 2. The human lungs can operate against a pressure differential of up to one twentieth of an atmosphere. If a diver uses a snorkel for breathing, how far below water level can he swim? 3. Where does the average speed of air molecules in still air at room temperature fit into the following sequence? 2 m s -1 (walking speed) 30 ms -1 (fast car) 500 ms -1 (concorde) 1.1x10 4 ms -1 (escape velocity from earth) 3x10 8 ms -1 (speed of light)? 4. The average velocity of the molecules in a gas must be zero if the gas as a whole and the container are not in translational motion. Explain how it can be that the average speed is not zero. 5. The equation of state for a non-ideal gas is often written in terms of a virial expansion, the first two terms of which are: pV = RT (1 + B p ) The second virial coefficient , B ’, takes the form B ’ = a b e c / T (a) What is the physical origin of the second virial coefficient i.e. why do real gases deviate from ideal behaviour? (b)

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PropsOfGasesProbs08 - Properties of Gases Problems 1 An...

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