Lec-25-Chap-10-2

Lec-25-Chap-10-2 - CHE 131 Lecture 25 Gas density, partial...

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1 CHE 131 Lecture 25 – Gas density, partial pressures, real gases Prof. Wong Chapter 10: pp. 457-467. Combined Gas Law At constant mass of gas V α T/P V = d × (T/P) where d is a proportionality constant (VP)/T = d V 1 P 1 = d = V 2 P 2 T 1 T 2 V 1 P 1 = V 2 P 2 T 1 T 2
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2 Ideal Gas Law V α (n × T)/P V = R × (n × T)/P where R is proportionality constant P × V = n × R × T Conditions at 0ºC and 1 atm are referred to as standard temperature and pressure conditions (STP). p.451
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3 How does Kinetic Molecular Theory account for the ideal gas law? Boyle’s : Decreasing V increases the frequency of particle collisions with the wall, increasing P. Charles’s: Increasing T increases the speed of particles. P, V term must increase to maintain constant P. Avogadro’s: Increasing quantity of gas increases the frequency of particle collisions with the Ideal Gas Constant R – universal gas constant, same for all gaseous substances!
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4 Example: What volume will 24.0 g O 2 (MM 32.0) occupy at 25 ° C and a pressure of 0.888 atm ? ( 24.0 g
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Lec-25-Chap-10-2 - CHE 131 Lecture 25 Gas density, partial...

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