Cathy has 3.5 grams of NaCl. Does she have enough to make 400 mLs of a .3M solution of NaCl?

Update:

Thanks for the help, well done.

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  • 9 years ago
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    let us calculate how many mLs we can make :

    MV/1000=X/Mw

    0.3*V/1000=3.5/58

    V=201 mL

    so no 3.5 g is not enough

    another way:

    M=n/1L

    0.3=x/58

    x=17.4g in 1L

    so x=17.4*0.4=6.96 g for 400 mL

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  • Anonymous
    9 years ago

    NaCl has a formula wt. of 58.44; so to make 400mls of .3M NaCl requires 58.44 x .3 x 400/1000 =

    7.013 grams of NaCl to make the proper solution. She doesn't have what it takes, alas.

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