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    What mass of iron(II) sulfate would be needed to provide 28 grams of iron?
    Remember to give the unit.

    Relative atomic masses: O = 16; S = 32; Fe = 56.
    Relative formula mass for this FeSO4 = 152

    Can some one pls tell me step by step how to do it
    thanks =) x
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    mol = mass / Mr
    so mol Fe = 28/56 = 0.5

    therefore

    mass = mol x Mr = 0.5 x 152 = 76grams

    (This is what i'd do, it might be wrong in which case - sorry :o:)
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    you are right btw
    hahaha i knew what the answer was but i didn't know how to solve it tbh
    its the techer who didnt explain how to do it properly :woo:
    thanks x

    (Original post by TwirlGirl)
    mol = mass / Mr
    so mol Fe = 28/56 = 0.5

    therefore

    mass = mol x Mr = 0.5 x 152 = 76grams

    (This is what i'd do, it might be wrong in which case - sorry :o:)
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    (Original post by zahir27)
    you are right btw
    hahaha i knew what the answer was but i didn't know how to solve it tbh
    its the techer who didnt explain how to do it properly :woo:
    thanks x
    phew :p: it wouldn't have boded well if i was wrong..got an A2 chemistry exam next week :p:
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    haha well good luck then
    I got mine tommorow :eek3: :eek3:
    so doing some hardcore revision ahaha

    (Original post by TwirlGirl)
    phew :p: it wouldn't have boded well if i was wrong..got an A2 chemistry exam next week :p:
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    The method I use is to:

    56/56 = 1

    152/56 = 2.71428...

    Then 2.71428... X 28 = 76g
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    Now this is even more easier ahaha
    thanks x :cool:

    (Original post by MrMonopoly)
    The method I use is to:

    56/56 = 1

    152/56 = 2.71428...

    Then 2.71428... X 28 = 76g
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    (Original post by MrMonopoly)
    The method I use is to:

    56/56 = 1

    152/56 = 2.71428...

    Then 2.71428... X 28 = 76g
    That's the method I always use. My teacher used to do it the other way during lessons it just gets so confusing. This makes it a lot easier, and the questions they give us in the exam should always be able to be done without using moles.
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    (Original post by TwirlGirl)
    mol = mass / Mr
    so mol Fe = 28/56 = 0.5

    therefore

    mass = mol x Mr = 0.5 x 152 = 76grams

    (This is what i'd do, it might be wrong in which case - sorry :o:)
    I can confirm this is correct. How was your exam?
 
 
 
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