Molar Volume.

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Aim: How to convert from moles to volume and vice versa

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Presentation transcript:

Molar Volume

Counting Without Counting If you had to count the number of coffee beans in this bag how would you do it? How long would it take?

Counting Atoms in a Sample by Mass Weigh out 2 moles of Carbon 2 mol C x 12 g C = 24 g C 1 1 mol C Weigh out 2 moles of Helium 2 mol He x 4 g He = 8 g He 1 1 mol He

Gases How do we count the number of atoms in objects that are difficult to weigh…. Like gases? To find out more, we need to explore the properties of gases

Properties of Gases Gases do not have definite volume. They expand to fill the entire container. The volume of the container is the volume of the gas Gases are compressible. The volume of a gas changes dramatically with temperature and pressure

Molar Volume Molar volume is the volume of one mole of gas, under a specific set of temperature and pressure conditions Those conditions are known as Standard Temperature and Pressure (STP) 0o Celcius (about 32oF) 1 atmosphere of pressure (1 atm). The molar volume of any gas at STP is 22.4 L This is true for any gas. It doesn’t matter which gas.