Molar Volume Avogadro’s Law: Equal volumes of gas at the same temperature and pressure contain equal numbers of particles. But the mass is different!!!

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Presentation transcript:

Molar Volume Avogadro’s Law: Equal volumes of gas at the same temperature and pressure contain equal numbers of particles. But the mass is different!!!

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Molar Volume 1 mole of any gas occupies 22.4 L at Standard Temperature & Pressure (STP) [

Molar Volume What is STP? Scientists designate this so that measurements can be made anywhere under controlled conditions. T = 273 K P = 1 atm

Molar Volume Example: What is the volume of 20.0 g of Argon gas at STP? 20.0 g Ar1 mol Ar 40.0 g Ar 22.4 L Ar 1 mol Ar = 11.2 L Ar

Molar Volume Example: A helium balloon is filled to a volume of 4.00 L, how many helium atoms is this at STP? 4.00 L He1 mol He 22.4 L He 6.02 x atoms 1 mol He = 1.08 x atoms He