Lecture 32

# Lecture 32 - Partial Pressure the pressure of a single gas...

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Tro, Chemistry: A Molecular Approach 1 Partial Pressure the pressure of a single gas in a mixture of gases is called its partial pressure we can calculate the partial pressure of a gas if we know what fraction of the mixture it composes and the total pressure or, we know the number of moles of the gas in a container of known volume and temperature the sum of the partial pressures of all the gases in the mixture equals the total pressure Dalton’s Law of Partial Pressures because the gases behave independently

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Tro, Chemistry: A Molecular Approach 2 Composition of Dry Air
Tro, Chemistry: A Molecular Approach 3 The partial pressure of each gas in a mixture can be calculated using the ideal gas law V T x R x n P P P n n n same the are mixture in the everything of volume and re temperatu the V T x R x n P V T x R x n P together mixed B, and A gases, for two total B A total B A total B B A A = + = + = = =

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Tro, Chemistry: A Molecular Approach 4 Practice – Find the partial pressure of neon in a mixture with total pressure 3.9 atm, volume 8.7 L, temperature 598 K, and 0.17 moles Xe.
Tro, Chemistry: A Molecular Approach 5 Mole Fraction the fraction of the total pressure that a single gas contributes is equal to the fraction of the total number of moles that a single gas contributes total A total A n n P P = the ratio of the moles of a single component to the total number of moles in the mixture is called the mole fraction, χ for gases, = volume % / 100% total A A n n = χ the partial pressure of a gas is equal to the mole fraction of that gas times the total pressure total A A P P = χ

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