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

    Mar 26, 2007, 03:55 PM
    Mole problems in chemistry
    A compound that has one sulphur atom per molecule, contains 17.2% of sulphur by mass.What is the relative molecular mass of this compound?
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    J_9 Posts: 40,298, Reputation: 5646
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    #2

    Mar 26, 2007, 03:59 PM
    Please refer to this announcement.
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    Berstas Posts: 3, Reputation: 1
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    #3

    Mar 22, 2008, 12:28 PM
    1.) Phosphoric acid(HPO4)(aq) + Calcium Hydroxide(Ca(OH)2)(aq) --> ?
    I think it yeilds CaPO4 + 2H30.
    2.) If you have 3.5 moles of Calcium Hydroxide, how many moles of phosporic acid do you have?
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