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Homework Help: Combined gas law question

  1. Mar 28, 2013 #1
    A balloon is filled up with air to a volume of 1.15 L at 296.5 K.* What does the volume change to if the balloon is taken outdoors where the temperature is 278.4 K and the pressure is half of what it was indoors?

    V2 = (P1V1T2) / (T1P2)

    How do I find the initial pressure at 296.5 K if I know that at STP the pressure is 760 mm Hg at 273.15 K?
  2. jcsd
  3. Mar 28, 2013 #2
    What remains constant in the process? Pressure, temperature, volume or moles?

    If P is the initial pressure, what's the final pressure?
  4. Mar 28, 2013 #3
    The moles would remain constant... how does this help me?
  5. Mar 28, 2013 #4
    Right! So what are the initial moles and final moles? Write the expressions. Do not evaluate.
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