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One brand of laundry bleach is an aqueous solution containing 4.00% sodium hypochlorite (NaOCl) by mass
What is the molarity of this solution? (Assume a density of 1.02 g/mL .)

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    The question tells us that the concentration of the solution is 4.00% w/w.
    That is 100 g of the solution contains 4.00 g NaOCl.
    That is 1000 g of the solution contains 40.0 g NaOCl

    The volume occupied by 1000 g is
    1000g/1.02 g ml^-1 = 980.4 ml

    Molar mass of NaOCl is 74.44 g/mol

    Number of moles of NaOCl is

    40.0 g/74.44 g/mol = 0.5373 mole

    so molarity is

    moles/volume =

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