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3 April, 08:48

What is the percent mass/volume and molarity of sodium chloride solution, if 2.0grams of salt is collected by evaporating from 30.0ml of sodium chloride solution?

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  1. 3 April, 09:00
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    M (NaCl) = M (Na) + M (Cl)

    =23+35

    =58 g/mol

    n=m/M n=c. v ρ=m/v

    m=2g v=30ml=0.03l

    molarity of sodium chloride is:

    n=m/M

    =2/58

    =3.4.10 (-2) mol

    the percent mass/volume is:

    ρ=2/0.03

    =2/3 10^2 g/l
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