Ch. 13/14 Pt. 2 IDEAL GAS LAW.

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Ch. 13/14 Pt. 2 IDEAL GAS LAW

What is an Ideal Gas? P = pressure in atm or kPa V = volume in L A gas that will behave according to the following equation: PV = nRT P = pressure in atm or kPa V = volume in L n = moles R = ideal gas constant 0.0821 or 8.31 T = temperature in K DEPENDS ON PRESSURE UNIT!

Ideal Gas Video https://www.youtube.com/watch?v=8SRAkXMu3d0&index=14&list=PL 8dPuuaLjXtPHzzYuWy6fYEaX9mQQ8oGr

Solving for ONE of the variables Basic equation: PV = nRT Solve for pressure: P = nRT Solve for volume: V = nRT V P Solve for moles: n = PV Solve for temperature: T = PV RT nR

Learning Check Use the ideal gas law PV = nRT to solve the following problem. Q: How many mols of Helium could fit into a 0.5L bag at 50°C and 2atm? First step: Identify all variables! Second step: Which R do I use? Look at the P units! If atm: 0.0821 If kPa: 8.31 Third step: Check that all units are correct; P should be atm/kPa, V should be L, T should be K Fourth step: Plug in all numbers and solve! n = PV n = (2 x 0.5)/(0.0821 x 323.15) RT P V T n = .037 mols of Helium