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Mastering Chemical Quantities: Moles & Volume Conversions

Learn to calculate gas volume at STP, mole-to-volume conversions, 2-step conversions with volume-mass-particles, and understand the mole concept.

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Mastering Chemical Quantities: Moles & Volume Conversions

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  1. Unit 7: Chemical Quantities Moles <-->Volume

  2. After today, you will be able to… Calculate the volume of a gas at STP given the number of moles and vice versa Perform two step volume conversions (Ex: atoms to liters)

  3. Mole  Volume Conversions For one mole of any gas at STP, the volume occupied will be 22.4 liters. STP = standard temperature and pressure = 0 degrees Celsius and 1 atmosphere 1 mole gas = 22.4 L gas

  4. Example: How many moles of Helium gas will occupy a volume of 149.3L at STP? K: 149.3L He U: ? mol He 149.3 L He 1 mol He . x 6.665 mol He = 22.4 L He 1

  5. 2-Step Conversions with Volume, Mass, and Particles We have already learned… How to convert moles into particles and vice versa by using the conversion factor… 1 mole = 6.02x1023 atoms, molec. or F.U. How to convert moles into grams and vice versa by using the conversion factor… 1 mole = atomic mass in grams How to convert moles into liters and vice versa by using the conversion factor… 1 mole = 22.4 L

  6. All Roads Lead to the Mole # of liters 1 mole = 22.4 Liters 1 mole = 6.02 x 1023 particles MOLE # of particles (atoms, molecules or formula units) 1 mole = (Molar Mass) grams # of grams

  7. Example: What volume would 4.32x1023 atoms of Krypton gas occupy at STP? K: 4.32x1023 atoms Kr U: ? L Kr 4.32x1023 atoms Kr 1 mol Kr . 22.4 L Kr . x x = 6.02x1023 atoms Kr 1 mol Kr. 1 16.1 L Kr

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