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    The answer is 1.79*10-4
    But I do not understand how the mark scheme got to it :/ ?
    I know the ratio is 1:5
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    1) Unit conversion
    2) Mole equation
    3) Answer

    Show the whole question please.
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    (Original post by AlphaArgonian)
    1) Unit conversion
    2) Mole equation
    3) Answer

    Show the whole question please.
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    (Original post by Hazel99)
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    Convert mg to grams. So 10mg to grams is 10/1000 = 0.01 grams of Fe2+

    Then, to find moles, do mass/molecular mass which is 0.01/55.8 = your answer.
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    moles = mass/mr

    10mg = 0.01g (mass)
    Fe (Iron) Mr = 55.8

    moles = 0.01/55.8

    Just remember the equation moles = mass/Mr.

    /ninjad!
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    (Original post by Hazel99)
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    So yeah convert mg to g (10mg = 0.01g) then use the n=M/Mr equation
 
 
 
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