Lecture 4 gas and ideal gas law

# Lecture 4 gas and ideal gas law - Section 5.1 Early...

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Section 5.1 Early Experiments o n Gas Greek believe the world is made of four elements: Earth, wi nd, fire and water. Chinese believe there are 5 elements: Water, Wood, Earth, Fire, Metal. Jan Baptista Van Helmont (1577-1644): Discovered the ga s made from burning wood is different from air; Evangelista Torricelli (1607-1647): invented barometer to m easure pressure of gas; Otto von Guericke: Demonstrated that vacuum can be mad e by a pump.

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FIGURE 5.1: A Torricellian Barometer
Otto von Guericke’d demonstrati on of air pressure

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Pressure Pressure= Force/Area 1 atm = 760 mmHg = 760 torr =101,325 Pa 1 Pa = 1N/m2 1 Psi = 1 pound per square inch = 6,894.75729 Pa
Section 5.2 Gas Laws of Boyle, Charles and Avogadro Robert Boyle (1627-1691) PV= k Jacques Charles (1746-1823) V= b T Amedeo Avogadro (Lorenzo Romano Am edeo Carlo Avogadro, conte di Quaregna e Cerreto, 1776-1856) V= an

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Boyle’s Experiments
Plots of Boyle's Data

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Boyle is not always accurate Why Boule got good data that showed line ar behavior between P and 1/P? 1) He used ideal gas . 2) He faked data. 3) His measurement s are not accurate . http:// group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/gaslaw/boyles_
Example Assuming the temperature is the same and the gas follow ideal behavior: 0.050 x 4.0 x106 = 2.0 x 105 L

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Charles’s Law: V vs. T (in degrees Cel sius) for Several Gases

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Charles’s Law: V vs. T (in degrees Kelvin) for Several Gases
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