1. 3.4Molar Volume Molar Volume The Molar Volume of Gases Multi-Step Conversions Involving the Volume of a Substance Molar Volume and Density

2. Molar Volume text page 132 The molar volume of a substance is the space occupied by a mole of its particles. A substance’s molar volume is determined by the size and spacing of its particles although the size of the particles has little effect on a gas’ molar volume because gas particles are so spread out. Substances expand when heated and thus their molar volume is greater at higher temperatures. 3.4Molar Volume

3. The Molar Volume of Gases text pages 132-133 Avogadro’s hypothesis states that equal volumes of different gases, measured at the same temperature and pressure, have equal numbers of particles. For example, the molar volume of any gas at 0 o C and 101.3 kPa is approximately 22.4 L. Chemists refer to 0 o C and 101.3 kPa as standard temperature and pressure or STP for short. 3.4Molar Volume

4. text pages 133-134 3.4Molar Volume The Molar Volume of Gases Examples: 1.3 mol NO 2 x 22.4 L NO 2 = 29 L NO 2 1 mol NO 2 29 L NO 2 x 1 mol NO 2 = 1.3 mol NO 2 22.4 L NO 2

5. Multi-Step Conversions ( Involving the Volume of a Substance ) 3.4Molar Volume text pages 134-136 A quantity of a substance can only be related to another quantity of the same substance through the mole.

6. 3.4Molar Volume text pages 134-136 e.g. 5.0 L N 2 x 1 mol N 2 x 6.02 x 10 23 molecules N 2 = 1.3 x 10 23 molecules N 2 22.4 L N 2 1 mol N 2 Multi-Step Conversions ( Involving the Volume of a Substance )

7. 3.4Molar Volume text pages 134-136 Multi-Step Conversions ( Involving the Volume of a Substance ) e.g. 2.0 g C x 1 mol C x 1 mol C 3 H 8 x 22.4 L C 3 H 8 = 1.2 L C 3 H 8 12.0 g C 3 mol C 1 mol C 3 H 8 Carbon C moles grams litres atoms molecules Propane C 3 H 8

8. 3.4Molar Volume text page 137 Molar Volume and Density Density is the amount of matter in a given volume. Density is a conversion factor that relates a substance’s mass directly to its volume. e.g. 2.0 L O 2 x 1.43 g O 2 = 2.8 g O 2 1 L O 2

9. 3.4Molar Volume text pages 137-138 Molar Volume and Density Molar Volume = Molar Mass Density e.g. 32.0 g O 2 x 1 L O 2 = 22.4 L O 2 1 mol O 2 1.43 g O 2 mol O 2