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Avogadro’s law

Avogadro’s law. Ideal gases and molar volume. Avogadro’s Law. STP stands for standard temperature & pressure (0 °C and 1 atm). 1 mol H 2 at STP = 22.4 L. 1 mol O 2 at STP = 22.4 L. Constant temperature Constant pressure. Avogadro’s Law.

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Avogadro’s law

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  1. Avogadro’s law Ideal gases and molar volume

  2. Avogadro’s Law STP stands for standard temperature & pressure (0°C and 1 atm) 1 mol H2 at STP = 22.4 L 1 mol O2 at STP = 22.4 L

  3. Constant temperature Constant pressure Avogadro’s Law equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.

  4. Molar Volume of Gases • The volume occupied by one mole of a gas at STP is known as the standard molar volume of a gas. It has been found to be 22.4 L. • 1 mol = 22.4 L will be the conversion factor used in Avogadro’s law.

  5. 0.0680 mol x 22.4 L = 1.52 L O2 1 mol Sample Problem 1 • A chemical reaction produces 0.0680 mol of oxygen gas. What volume in liters is occupied by this gas sample at STP? • Using our conversion factor of 1 mol = 22.4 L to solve for volume

  6. Sample Problem 2 • A chemical reaction produced 0.098 L of sulfur dioxide gas, SO2, at STP. What was the mass (in grams) of the gas produced?

  7. 0.098 L SO2 x 1 mol x 64.07 g = 0.28 g SO2 1 mol 22.4 L Sample Problem 2 • First find molar mass of SO2: 1 x S = 32.07 g/mol 2 x O = 16 x 2 = 32 g/mol 64.07 g/mol

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