L7 Gas Laws Notes.pdf - 1 Lecture 7 Gas Laws 1 Gas Laws Extensive • Gas Variables 2 Gas Variables V n T P Intensive V 1 ^ V = = n[A Moles(n – number

L7 Gas Laws Notes.pdf - 1 Lecture 7 Gas Laws 1 Gas Laws...

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1 Lecture 7 Gas Laws 1 Gas Laws Gas Variables Gas Laws (Quantitative Relationships) Gas Mixtures Stoichiometry with Gases 2 Gas Variables V , n , T , P Volume (V) – amount of space Moles (n) – number of molecules/atoms Temperature (T) – related to average kinetic energy of molecules (more next time) Pressure (P) – … Extensive Intensive V ^ = V n 1 [A] = 3 Pressure P = Force Area 5 kg gas Pressure acts equally in all direction 4 Atmospheric Pressure P atm = F / A F = Weight of Atmosphere A = Surface Area of Earth P atm = 1.013 x 10 5 N/m 2 = 1.013 bar = 1 atm = 760 mmHg = 760 torr
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2 Lecture 7 Gas Laws 5 Measuring Pressure Barometer Vacuum (P = 0) P atm h P atm = r gh = h ( in mmHg) Manometer P atm P gas h P gas = P atm + h (all in mmHg) 6 Gas Laws Boyle: PV = constant (for const n,T) Charles: V = const x T (for const n,P) Avogadro: V = const x n (for const T,P) Ideal Gas Eqn : PV = nRT 7 Boyle’s Law PV = const 1 P 5 kg V 1 10 kg V 2 P 1 V 1 = P 2 V 2 V = const x 8 Boyle’s Law Graph of V vs. P is nonlinear Graph of V vs. 1/P is linear
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3 Lecture 7 Gas Laws 9
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