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Unformatted text preview: 1 CHAPTER 10 CHAPTER 10 GASES GASES 2 CONTENT 10.1 Characteristics of Gases 10.2 Pressure 10.3 The Gas Laws 10.4 The IdealGas Equation 10.5 Further Applications of The Ideal Gas Equation 10.6 Gas Mixture and Partial Pressures 10.7 KineticMolecular Theory 10.8 Molecular Effusion and Diffusion 10.9 Real Gases: Deviations from Ideal Behaviour 3 Learning Outcomes • Able to apply the Ideal Gas Law in calculations involving gaseous system • Able to calculate partial and total pressure in a mixture of gases (with or without reaction) • Able to differentiate effusion and diffusion • Able to apply kinetic molecular theory in problem solving 4 Bonds  HGFGJDF 5 10.1 Characteristics of Gases 10.1 Characteristics of Gases  Expand spontaneously to fill its container.  Volume of gas = Volume of the container.  Highly compressible.  Form homogeneous mixtures with other gases.  Occupy about 0.1% of the volume of their containers. 6 10.2 Pressure 10.2 Pressure  Measured properties of a gas: Temperature (T), Volume (V), Pressure (P) Pressure, P is the force F acting on an object per unit area, A. P = F/A Our atmosphere exerts a downward force/pressure on Earth’s surface because of gravity. 7 10.2.1 Atmospheric Pressure and 10.2.1 Atmospheric Pressure and The Barometer The Barometer  The acceleration produced by earth’s gravity is 9.8 ms .  A column of air 1m in cross section has a mass of roughly 10,000 kg.  The force exerted by this column is: F = ma where, a = 9.8 m/s 2 = (10,000 kg) (9.8 m/s 2 ) = 1 × 10 5 kg m/s 2 = 1 × 10 N 8 Con’t: 10.2.1 Atmospheric Con’t: 10.2.1 Atmospheric Pressure and The Barometer Pressure and The Barometer  The pressure exerted by the column is the force divided by its crosssectional area, A: P = F/A = (1 × 10 5 N)/( 1m ) = 1 × 10 5 N/m 2 = 1 × 10 5 Pa = 1 × 10 2 kPa  SI unit for P = N/m 2 (also called Pascal, Pa) 1Pa = 1 N/m 2  1 bar = 10 5 Pa 9 Con’t: 10.2.1 Atmospheric Con’t: 10.2.1 Atmospheric Pressure and The Barometer Pressure and The Barometer  Therefore, the atmospheric pressure at sea level is about 100kPa.  The actual atmospheric pressure at any location depends on weather conditions and on altitude....
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This note was uploaded on 06/16/2011 for the course ENGR 101 taught by Professor Ahmed during the Summer '11 term at Multimedia University, Cyberjaya.
 Summer '11
 ahmed

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