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Avogadro’s Law Gas Density

Avogadro’s Law Gas Density. Relationships between amounts of gas and volume. The volume of a gas at constant temperature and pressure is proportional to the number of moles of gas: V  n  means “proportional to” V = kn V 1 /n 1 = V 2 /n 2. Avogadro’s Law.

JasminFlorian
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Avogadro’s Law Gas Density

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  1. Avogadro’s LawGas Density Relationships between amounts of gas and volume

  2. The volume of a gas at constant temperature and pressure is proportional to the number of moles of gas: • V  n •  means “proportional to” • V = kn • V1/n1 = V2/n2 Avogadro’s Law

  3. The volume of 1.0 mole of any gas at STP is 22.4 L. • This is called the standard molar volume. • The volume of any gas at STP can be calculated if the number of moles is known: • V = (moles) x 22.4 Standard Molar Volume

  4. One mole of gas at STP has a volume of 22.4 L. How many moles of gas are present in a 3.00 L container at STP? • If 0.222 mol of a gas has a volume of 5.13 L. How many moles of gas would be present if the volume was 7.47 L (at the same temperature and pressure)? • A 21.0 g lump of dry ice (carbon dioxide) completely sublimes. The resulting CO2 gas occupies a volume of 11.5 L. What would be the volume of 1.00 mol of CO2? • 22.0 g of CO2 occupies a volume of 11.2 L at STP. Calculate the volume of 44.0 g of CO2 at STP. Avogadro’s Law Problems

  5. Density = mass/volume • Calculate the density of CH4 at STP • Assume 1 mole of CH4 • V= 22.4 L • density = mass/volume = 16/22.4 • 0.714 g/L Density of Gases

  6. Calculate the density of chlorine gas at STP. • Determine the density of helium gas at STP. • What is the volume of 0.200 g of hydrogen gas at STP? • How many moles of nitrogen gas can be in a balloon with a volume of 6.00 L at STP? Density of Gases Problems

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