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    asheppard13's Avatar
    asheppard13 Posts: 3, Reputation: 1
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    #1

    Mar 26, 2012, 04:50 PM
    What is the mass of rust, Fe2O3, that contains 10.0g of iron?
    What is the mass of rust, Fe2O3, that contains 10.0g of iron?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    Mar 27, 2012, 08:44 AM
    Method 1: Figure out how many moles of Fe atoms weigh 10g. The number of moles of rust that contains that number of Fe atoms is that number divided by 2 (because there are 2 Fe atoms per molecule). Then multiply by the weight per mole of rust to get the weight of rust that has 10g of Fe.

    Another method, a bit less tedious: Figure out what percent of a rust molecule is iron by weight. Then divide that into 10g to get the weight of rust required to have 10g of Fe.
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