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Avogadro’s Law

Volume and Moles. Avogadro’s Law. Avogadro’s Law. When the number of moles of gas is doubled (at constant temperature and pressure, the volume doubles. The volume of gas is directly proportional to the number of moles if temperature and pressure remain constant. Avogadro’s Law is written:.

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Avogadro’s Law

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  1. Volume and Moles Avogadro’s Law

  2. Avogadro’s Law • When the number of moles of gas is doubled (at constant temperature and pressure, the volume doubles. • The volume of gas is directly proportional to the number of moles if temperature and pressure remain constant Avogadro’s Law is written: OR n = number of moles V = Volume

  3. As the number of moles increases, the volume increases and the temperature and pressure remain the same

  4. Using Avogadro’s Law Suppose we have a 12.2-L sample containing 0.50 mol of Oxygen gas at a pressure of 1 atm and temperature of 25 oC. If all of this O2 is converted to ozone, O3, at the same temperature and pressure, what will be the volume of ozone formed? • Step 1:Use a balanced equation to determine the mole ratio. • Step 2: Calculate the number of moles of O3 that will be produced • Step 3: Use the equation and determine the initial and final conditions • Step 4: Solve 3O2 2O3

  5. Avogadro’s Law Practice Problems: • If 0.105 mol of hydrogen gas occupies a volume of 2.35 L at a certain temperature and pressure what volume would 0.337 mol of hydrogen gas occupy under the same conditions? • If 1.00 mol of helium occupies a volume of 22.4 L at 273 K and 1.00 atm, what volume will 1.00 g of helium occupy under the same conditions? • If 3.25 mol of argon gas occupies a volume of 100.0 L at a particular temperature and pressure, what volume does 14.15 mol of argon occupy under the same conditions? • If 2.71 g of argon gas occupies a volume of 4.21 L, what volume will 1.29 mol of argon occupy under the same conditions? • If 1.5 mol of nitrogen gas (N2) has a volume of 36.7 L and a second sample has a volume of 16.5 L under the same temperature and pressure conditions. How many moles of Nitrogen gas are there in the second sample?

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