10_Ch10_1 - Chapter 10 What is pressure? Gases Pressure and...

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Mary J. Bojan Chem 110 Chapter 10 What is pressure? Gases Pressure and Boyle’s Law Temperature and Charles’ Law Avogadro’s Law Ideal gas equation of state PV=nRT Partial Pressures Dalton’s Law Kinetic Molecular Theory of gases Ideal Gas Real gases 1 Density of an ideal gas Molecular Weight of an ideal gas M = dRT P d P RT = M
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Mary J. Bojan Chem 110 PRESSURE Pressure: force/area F(newtons)/A(m 2 ) SI Units: 1N/ m 2 = 1Pa Pascal Standard atmospheric pressure**: 1 atm ! 1.013x10 5 Pa 1 atm = 760 torr (mm Hg) 1 atm = 14.7 lb/in 2 **real atmospheric pressure varies with altitude and weather 2 What causes atmospheric pressure? How big is one atm?
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Mary J. Bojan Chem 110 Pressure decreases exponentially with altitude. WHY? What is pressure? 3 Pressure at any altitude depends on weight of gas above it.
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Mary J. Bojan Chem 110 Pressure and altitude Altitude P collision frequency (km) (atm) (sec -1 ) 0 1 10 10 50 10 -3 10 7 100 10 -6 10 3 200 10 -13 1 4
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Mary J. Bojan Chem 110 Measuring Pressure
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10_Ch10_1 - Chapter 10 What is pressure? Gases Pressure and...

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