4.3 The Mole and Volume.

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Presentation transcript:

4.3 The Mole and Volume

Mole Rules The chemical formula represents a mole of that substance. One mole of any substance contains 6.02 E 23 particles. The formula mass, expressed in grams, represents the mass of one mole of that substance. One mole of any gas, at STP conditions, occupies 22.4 litres of volume. 2

IV. One mole of any gas, at STP conditions, occupies 22 IV. One mole of any gas, at STP conditions, occupies 22.4 litres of volume. The volume of a gas is usually measured at STP (standard temp. and pressure). Standard temp is O°C Standard pressure is 101 kPa At STP, 1 mole of any gas occupies a volume of 22.4L. This is known as the molar volume of a gas. Therefore, the conversion factor looks like this: 1 mole = 22.4L

Moles to Volume Calculations

THE MOLE ROAD MAP Formula weight (g) Formula weight (g)

THE MOLE ROAD MAP

1. Determine the volume, in litres, of 0 1. Determine the volume, in litres, of 0.600mol of Sulfur dioxide gas at STP. Given: 0.600mol Unknown: volume Conversion Factor: 1mol = 22.4L Solution: = 0.600mol x 22.4L = 13.4L of S02 1mol

2. Determine the number of moles in 33.6L of Helium gas. Given: 33.6L Unknown: moles Conversion Factor: 1mol = 22.4L Solution: = 33.6L x 1mol = 1.50 mol He 22.4L

Assignment a) 215.04L 0.5mol 1.12 L 26.88 L a) 4.00L b) 44.6L c) 71.68L d) 16.8L a) 4.00L b) 44.6L c) 0.0242L 3. 3.35mol 0.80mol 0.016mol 0.672L 0.5mol 1.12 L 26.88 L 9

Check Point! What is the volume of 3.23mol of krypton at STP? A sample of oxygen gas occupies 63.1L at STP. How many moles of oxygen gas is this? 72.35L 2.82mol

Check Point! What is the volume of 0.037mol of Hydrogen gas at STP? A sample of helium gas occupies 2.31L at STP. How many moles of helium gas is this?

Mixed Mole Problems

Mixed Mole Check Point How many Liters would 1.75 x 1024 molecules of oxygen gas at STP occupy? How many moles of oxygen atoms are in the sample of oxygen gas from #1? How much would the oxygen atoms from question #2 weigh? How much would the oxygen gas from question #2 weigh? 13

Mixed Mole Check Point #2 How many atoms of hydrogen are there in 8.9 x 10-23g of water molecules? How many Liters would 3.7 x 1026 molecules of CO gas at STP occupy? How many grams would the CO in #2 weigh? 14