03 Notes - Gas Laws II

03 Notes - Gas Laws II - 2 Ideal Gas Law Relates pressure...

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Pluchino Regents Chemistry Phases of Matter 03 Gas Laws II Aim: How do gases behave? Do Now: Why do helium balloons float? Density of Gases What is the density of nitrogen? D = m/v 1 mol @STP = 22.4 L N 2 = 28.00 g/mol 28.00 g x 1 mole = 1.25 g/L 1 mol 22.4 L What is the density of methane? 16 g x 1 mol = 0.714 g/L 1 mol 22.4 L Rate of Diffusion Molecules with a small mass travel faster than heavier molecules. You have three balloons, H 2 , He and O 2 . Which will deflate the fastest? Dalton’s Law of P artial Pressures If there is a mixture of gases, the total pressure of the system is equal to the sum of the pressures contributed by each gas. P tot = P 1 + P 2 + … A mixture of Ne and O 2 gas has a total pressure of 390 torr. If the pressure from Ne is 200 torr, what is the pressure of O
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Unformatted text preview: 2 ? Ideal Gas Law Relates pressure, volume, temperature and quantity in a single equation. PV = nRT R = 0.0821 atm-L/mol-K Must work in the units given in the constant! Practice: Use the ideal gas law 1. You have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 L. What is the temperature? 2. If I have an unknown quantity of gas held at a temp of 1195 K in a container with a volume of 25 L and a pressure of 560 atm, how many moles of gas do I have? Conclusions: Use molar volume to determine the density of a gas (22.4 L at STP) Methane bubbles are fun Rate of diffusion small molecules diffuse fastest Gases behave ideally at low pressures and high temperatures Work in the given units for the ideal gas law...
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