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    I cannot, for some reason, work out how to get the answer to question 4 of the 2001 Higher Chemistry paper. Can anyone help?

    Q) A mixture of sodium bromide and sodium sulphate is known to contain 5 mol of sodium and 2 mol of bromide ions.

    How many moles of sulphate ions are present?

    A) 1.5
    B) 2.0
    C) 2.5
    D) 3.0

    The correct answer is A but I don't know how to get it!
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    (Original post by agmcleish)
    I cannot, for some reason, work out how to get the answer to question 4 of the 2001 Higher Chemistry paper. Can anyone help?

    Q) A mixture of sodium bromide and sodium sulphate is known to contain 5 mol of sodium and 2 mol of bromide ions.

    How many moles of sulphate ions are present?

    A) 1.5
    B) 2.0
    C) 2.5
    D) 3.0

    The correct answer is A but I don't know how to get it!
    What's the equation of sodium sulfate?
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    Na2SO4 I think!
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    (Original post by agmcleish)
    Na2SO4 I think!
    Good, now can you see the mole ratio in this formula?
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    Sent you a private message
 
 
 
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