Gas Volumes and the Ideal Gas Law

11.3

Volumes of Reacting Gases

• Gay-Lussac’s law of combining volumes of gases – at constant T and P, the V of gaseous reactants and products can be expressed as ratio’s of small whole numbers• Avogadro’s Law – V of gases at the

same T and P contain = # of molecules

Volumes of Reacting Gases

• Standard Molar Volume of a Gas – the V occupied by 1 mole of a gas at STP is 22.41410L or 22.41L• Ideal Gas Law – mathematical

relationship among P,V, T, and the number of molecules of a gas

Ideal Gas Law

• PV=nRT• R is Ideal Gas constant• Value depends on the units used• 0.0821 L•atm 8.314 L•kPa

mol•K mol•K

The Ideal Gas Law

• What is the P in atmospheres exerted by a 0.500 mol sample of Nitrogen gas in a 10.0 L container at 298 K?• What P in atmospheres, is exerted by

0.325 mol of H gas in a 4.08 L container at 35°C.

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