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    canida's Avatar
    canida Posts: 1, Reputation: 1
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    #1

    Jul 21, 2010, 04:53 PM
    How many moles of O 2 are there in a sample of 300 moles of clean dry air
    How many moles of O2 are there in a sample of 200 moles of clean, dry air?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jul 22, 2010, 04:27 AM

    Well, you need to know the percentage of the air which contains oxygen. Once you know that, just use proportions to get the answer. Post what you did :)
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