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    brittykitty's Avatar
    brittykitty Posts: 76, Reputation: 2
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    #1

    Oct 26, 2008, 04:28 PM
    Mass of potassium dichromate
    What is the mass of 5.00moles of potassium dichromate?

    I was guessing it would be 294.18 x 5.00 but I could be wrong, any suggestions? Thanks :)
    What would the correct formula be?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Oct 26, 2008, 04:32 PM

    If 294.18 is the correctly determined molecular mass, then yes you're right. Do you understand why?

    Important: what are the units?
    brittykitty's Avatar
    brittykitty Posts: 76, Reputation: 2
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    #3

    Oct 27, 2008, 02:38 PM

    Would it be?
    1470.9 g/mol?

    Because you have the mass times how many moles the potassium dichromate has and that should give you the molecular mass.. ahh its so confusing.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Oct 27, 2008, 02:50 PM

    The 294.18 is g/mol. Your result is just g. the mass.
    brittykitty's Avatar
    brittykitty Posts: 76, Reputation: 2
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    #5

    Oct 27, 2008, 02:53 PM

    So its 294.18g?
    brittykitty's Avatar
    brittykitty Posts: 76, Reputation: 2
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    #6

    Oct 27, 2008, 02:54 PM
    My teacher is marking it out of 2 marks so that why I figured there had to be some kind of formula to figure out
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #7

    Oct 27, 2008, 03:05 PM

    You have to correctly determine the molecular mass first, which is 294.18 and i assume you have the working for, then the mass you need to multiply that by the number of moles.
    brittykitty's Avatar
    brittykitty Posts: 76, Reputation: 2
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    #8

    Oct 27, 2008, 03:18 PM

    294.18 x 5.00 = 1470.9 g?
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