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The Mole–Volume Relationship

      • The Mole–Volume Relationship

What do you see?

Gases a and b are under the same temperature and pressure

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10.2

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The Mole–Volume Relationship

      • The Mole–Volume Relationship

Avogadro’s hypothesis states that at the same temperature and pressure equal volumes of different gases contain the same number of particles.

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10.2

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The Mole–Volume Relationship

      • The volume of a gas is usually measured at a
      • standard temperature and pressure (STP)

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      • STP means a temperature of 0oC
      • and a pressure of 1 atmosphere (atm)
      • or equivalent units.

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The Mole–Volume Relationship

What is the volume of 1 mol of gas?

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At STP, 1 mol of any gas occupies a volume of 22.4 L/ dm^3.

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The quantity 22.4 dm^3 is called the

molar volume of a gas.

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The Mole–Volume Relationship

    • Calculating Volume of gas at STP

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    • Practice: What is the volume, in liters (L), of 3.5 moles of a gas at STP?

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The Mole–Volume Relationship

    • Calculating using:

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    • Answer:
    • volume (L) = 3.5 moles X 22.4 L
    • 1 mol

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    • Volume (L) = 78.4 L (liters)

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The Mole–Volume Relationship

    • Calculating Molar Mass from Density at STP

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Practice: The density of a gaseous

compound is 1.964 g/L at STP.

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Calculate the m.m. of the compound.

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10.8

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SAMPLE PROBLEM

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10.8

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SAMPLE PROBLEM

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10.8

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SAMPLE PROBLEM

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REVIEW OF CONVERSIONS

10.2

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REVIEW OF CONVERSIONS

10.2

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REVIEW OF CONVERSIONS

10.2

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