# Dressen-Ideal Gas

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Category: Education

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### -Avogadro’s Law -STP molar volume of gas -Ideal Gas Law :

Ch. 11 – Molecular Composition of Gases -Avogadro’s Law -STP molar volume of gas -Ideal Gas Law

V n Avogadro’s Law Equal volumes of gases contain equal numbers of molecules (moles) at constant temp & pressure true for any gas

### Volume of Gas at STP:

At 1 atm and 273 K the volume of 1 mol o f gas is 22.4 L Volume of Gas at STP According to Avogadro’s law, 1 mole of any gas will occupy the same volume as one mole of any other gas at the same temperature and pressure

### Volume of Gas at STP:

Volume of Gas at STP

### Volume of Gas at STP:

Volume of Gas at STP

### Combined Gas Law to Ideal Gas Law:

Combined Gas Law to Ideal Gas Law Merge the Combined Gas Law with Avogadro’s Principle : Do derivation on board

### Ideal Gas Law:

Ideal Gas Law P= pressure V =volume n = number of moles R=universal gas constant T=temperature in Kelvins UNIVERSAL GAS CONSTANT R=0.0821 L atm / molK R=8.314 L  kPa / mol K PV= nRT

### Ideal Gas Law Problems:

GIVEN: P = ? atm n = 0.412 mol T = 16°C = 289 K V = 3.25 L R = 0.0821 L atm/molK WORK: PV = nRT P(3.25)=(0.412)(0.0821)(289) L mol L atm/molK K P = 3.01 atm Ideal Gas Law Problems Calculate the pressure in atmospheres of 0.412 mol of He at 16°C & occupying 3.25 L.

### Ideal Gas Law Problems:

Ideal Gas Law Problems What pressure is exerted by 0.450 mol of gas at 25 C if the gas is in a 0.650 L container?