Mixtures of gases when gases are mixed together their

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Mixtures of Gases When gases are mixed together, their molecules behave independent of each other all the gases in the mixture have the same volume all completely fill the container all gases in the mixture are at the same temperature (same E k ) Therefore, in certain applications, the mixture can be thought of as one gas even though air is a mixture, we can measure the pressure, volume, and temperature of air as if it were a pure substance we can calculate the total moles of molecules in an air sample, knowing P, V, and T, even though they are different molecules 32 Tro: Chemistry: A Molecular Approach, 2/e
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33 Composition of Dry Air Tro: Chemistry: A Molecular Approach, 2/e
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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 34 Tro: Chemistry: A Molecular Approach, 2/e
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The partial pressure of each gas in a mixture can be calculated using the ideal gas law 35 Tro: Chemistry: A Molecular Approach, 2/e
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