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Seawater contains approximately 3.5% by mass and has a density of 1.02 g/mL. What volume of seawater contains 5.5g of sodium

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    Seawater contains approximately 3.5% by mass and has a density of 1.02 g/mL. What volume of seawater contains 5.5g of sodium.

    What a badly worded question! There is no way you can calulate the mass of sodium from the information given as you need to know what proportion of the 3.5% by mass are sodium salts.

    What you could do is assume that all of the 3.5% is sodium chloride. So 100 g of seawater contains

    3.5 g of NaCl or

    3.5 g x23/58.4 of sodium.
    =1.38 g sodium

    so to get 5.5 g of sodium we need

    5.5 g x 100/1.38 of sea water
    =398.6 g

    To find the volume
    volume=mass/density

    volume = 398.6 g/1.02 g ml^-1
    =390.7 ml

    But check the maths!

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