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B3 solutions: Gases

1. The pressure exerted by a gas on the walls of a container is given by the equationP=1/3 ρcav2where ρ = densitycav = average speedGiven that the molar mass of air is 29g and its density is 1.3kgm-3 estimate how many molecules hit 1m2 of wall per second when the pressure is 100kPa.Hint:Solution:2. The volume of a fixed mass of gas at constant pressure is inversely proportional to the pressure. A 10m3 Helium balloon...

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