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Math Help - Molar Mass problem

  1. #1
    Junior Member
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    Oct 2008
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    Molar Mass problem

    How many moles of O atoms are in 2.03 mol of Fe_2_O_3_, the primary component of iron-based rust?

    I need to do this problem in dimentional analysis, but have no idea how to do it? I've tried this problem for 20 minutes and I still can't get things to cancel out.

    Thank you for any help!
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  2. #2
    Junior Member
    Joined
    Oct 2008
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    Ok, I solved this problem with some more work on it. However, this is how I got my answer:

    2.03mol Fe_2_O_3_(3molO/1molFe_2_O_3)(48gO/1molO)(1molO/48gO)

    From that I got the answer. Now, I realize that last step is redundant, but it's the only way I could get back to moles, and it worked. But, was there a better way to do this problem?

    And I have another question. I'd start a new thread, but the question in this one I really answered myself, lol.

    What is the mass in grams?
    0.663 μmol potassium hypoiodite
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