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    Gift's Avatar
    Gift Posts: 11, Reputation: 1
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    #1

    May 16, 2007, 04:36 PM
    Chemistry- the chemical equation dealing with molecules and heat
    I don't really understand the question.

    "A student heats 100.0g of copper(II)sulfate pentahydrate and obtains 58.2g of anhydrous copper(II) sulfate. What percent yield was obtained in this experiment? CuSO4 *5H2O + heat ==> CuSO4 + 5H2O"

    I don't really understand what the percent yield is. And what I learnt in class, I only deal with one molecule not like anhydrous copper(II) Sulfate. So I've no idea what should I do and figure this question out.

    Please help me.Thank you!:)
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    May 16, 2007, 10:27 PM
    Well 1 mole CuSO4 from 1 mole CuSO4*5H2O would be 100% yield...

    If you get less than 1 mole out, then it's less than 100% and you should be able to work out what percentage of the input you got out.
    Gift's Avatar
    Gift Posts: 11, Reputation: 1
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    #3

    May 17, 2007, 06:40 PM
    So how can I find the gram of CuSO4*5H2O ? Do I combine all the atomic mass or multiply?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    May 17, 2007, 10:23 PM
    Just find the molecular mass.

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