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How many moles of air escaped in container?-Need Help

  1. Sep 7, 2008 #1
    1. The problem statement, all variables and given/known data
    The are temperature and pressure in a laboratory are 20 degree C and 1 atm. A 1L container is open to the air. The container is then sealed and placed in a bath of boiling water. After reaching thermal equilibrium, the container is opened. How many moles of air escaped?


    2. Relevant equations




    3. The attempt at a solution

    No solution attemp has been made since I don't know how to start this problem
     
  2. jcsd
  3. Sep 8, 2008 #2

    tiny-tim

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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi curiousM! Welcome to PF! :smile:

    This is PV = RT question.

    Just ask yourself … which of P V and T are given, for the important time?

    The important time in this case is immediately after the container is opened. How much air at the temperature of boiling water can the container hold?

    And how much was actually inside?

    So how much must escape? :smile:
     
  4. Sep 10, 2008 #3
    Thanks fot the help.
     
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