Volumes of Gases in Chemical Reactions

Volumes of Gases in Chemical Reactions - Volumes of Gases...

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Volumes of Gases in Chemical Reactions Gasses are often reactants or products in chemical reactions Balanced chemical equations deal with the number of moles of reactants consumed or products formed For a gas, the number of moles is related to pressure (P), volume (V) and temperature (T) Example The synthesis of nitric acid involves the reaction of nitrogen dioxide gas with water: 3NO 2 ( g ) + H 2 O( l ) -> 2HNO 3 ( aq ) + NO( g ) How many moles of nitric acid can be prepared using 450 L of NO 2 at a pressure of 5.0 atm and a temperature of 295 K? (5.0 atm)(450 L) = n(0.0821 L atm/mol K)(295 K) = 92.9 mol NO 2 92.9 mol NO 2 (2HNO 3 /3NO 2 ) = 61.9 mol 2HNO 3 Collecting Gases Over Water Certain experiments involve the determination of the number of moles of a gas produced in a chemical reaction Sometimes the gas can be collected over water Potassium chlorate when heated gives off oxygen: 2KClO 3 ( s ) -> 2KCl( s ) + 3O 2 ( g ) The oxygen can be collected in a bottle that is initially filled with water
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Volumes of Gases in Chemical Reactions - Volumes of Gases...

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