Unit: Chemical Quantities

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Presentation transcript:

Unit: Chemical Quantities Notes Unit: Chemical Quantities Volume Conversions with the Mole

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)

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

Example: How many moles of Helium gas will occupy a volume of 149 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

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

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

Example: What volume would 4 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 1 mol Kr . 16.1 L Kr

WS #8 : How many molecules of OF2 would have a mass of 0.132 g? K: 0.132 g OF₂ U: ? molecules OF₂ 0.132 g OF₂ 1 mol OF₂_ x 6.02 x 10²³ molecules. x 1 mol OF₂ . 1 53.996 g OF₂ = 1.47x1021 molecules OF2

WS #1 : How many moles of nitrogen gas, N2, are there in 16 WS #1 : How many moles of nitrogen gas, N2, are there in 16.8 L of this gas at STP? K: 16.8 L N₂ U: ? mol N₂ 16.8 L N₂ 1 mol N₂__ x = 1 22.4 L N₂ 0.750 mol N₂

Time to Practice! Complete WS HOMEWORK: Time to Practice! Complete WS

Complete enough problems to earn 100 points!!!