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• What is the ideal gas law?

  PV = nRT
• What does P mean in PV = nRT? What units?

  Pressure (torr, atm, kPa)
• What does V mean in PV = nRT? What units?

  Volume - L
• What does n mean in PV = nRT?

  Moles
• What does R mean in PV = nRT?

  Ideal Gas Law Constant
• What does T mean in PV = nRT? What units?

  Temperature - K
• What is the ideal gas law constant for torr?

  62.4 torr x L _________ moles x K
• What is the ideal gas law constant for atm?

  0.0821 atm x L ------------------- moles x K
• What is the ideal gas law constant for kPa?

  8.31 kPa x L ---------------- moles x K
• When using the ideal gas law, what do you put in for n?

  Unless it gives it to you, you put 1 mole
• In boyle's law, V ∝ 1/p.
• In charles' law, V ∝ T
• In avogadro's law, V ∝ n
• If we add the law equations thar are proportional to V, what do we get?

  V ∝ nT/p
• When do you use PTV = PTV?

  For problems with changing conditions
• What do you use PV = nRT?

  For problems with one set of conditions, solving for either grams or moles, calculating either molecular weight (molar mass) or density, and stoichiometry at non-STP conditions
• What are the top 3 formulas

  PV = nRT D = m/V mm (MOLAR MASS) = g/mole
• If the temp doubles, what happens to the density?

  Increases
• If the pressure quadruples, what happens to the density?

  It quadruples
• How do you find the density of a gas at STP?

  You can just cancel out the units and get g/L, and use STP values
• How do you find the density of a gas at non-STP?

  You have to use PV = nRT to find volume because it's not at STP
• How do you find the molar mass of a gas at non-STP?

  You have to use PV = nRT to find the number of moles
• How do you find the molar mass of a gas at STP?

  Cancel terms, or use PV = nRT with 1 L (because it gives you density)
• How do you do stoich for gases when they're not at STP?

  For certain values, you will write NOT ___ (STP value) and then they will cancel
• Do real gases behave according to the KTG?


  No
• What are the properties of real gases

  Have molecules that occupy space Have attractive and repulsive forces
• What is an ideal gas?

  Gas that conforms exactly to the KTG
• There is no such thing as an ideal gas.
• Where do gases behave closely to ideally?

  Low pressures and high temperatures
• What happens to gases at low temperatures and high pressures?

  They deviate grealty from ideal behavior
• How are gases that are close to ideal?

  Small and nonpolar
• What are the most ideal gases?

  H2, He, Ne
• What are not too bad on the ideal scale for gases?

  O2 and N2
• Which gases are not even close to ideal?

  NH3, H2O, HCl
• What are the ideal conditions?

  Low pressure, high temperature
• What are the ideal characteristics?

  Small, nonpolar
• When do gases react?

  Only if their particles collide with one another
• When is the ideal gas law NOT necesaary?

  For problems with grams and liters at STP
• When is the IGL neccessary?

  For problems with grams and liters NOT at STP