Use the molar volume to calculate each of the following at STP.
Part A
Calculate the number of moles of  O2
  in 2.44  L
  of  O2
  gas.
Express your answer with the appropriate units.
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Part B
Calculate the volume, in liters, occupied by 1.37 moles of  N2
  gas.
Express your answer with the appropriate units.
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Part C
Calculate the volume, in liters, occupied by 60.1  g
  of  Ar
  gas.
Express your answer with the appropriate units.
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Part D
Calculate the number of grams of  H2
  in 1620  mL
  of  H2
  gas.
Express your answer with the appropriate units.