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Cards (39)

  • 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, V1/p.
  • In charles' law, VT
  • In avogadro's law, Vn
  • If we add the law equations thar are proportional to V, what do we get?
    VnT/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