Calculate the concentration of each solution in mass %.  1.135g KCl in 608 g H2O  2. 30.3mg KNO3 in  9.72g H2O3. 8.00g C2H6O in 70.2g H2O ?

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  • 2 months ago

    1.135g KCl in 608 g H2O  

    The percentage concentration of any solution is most commonly expressed as mass percent:

    Mass % of any component of the solution =

    (Mass of the component in the solution / Total mass of the solution) x 100

    Other methods are:

    Volume percentage:

    Volume % of a component = 

    (Volume of the component/Total volume of the solution) x 100

    Mass by volume percentage:

    It is the mass of solute dissolved in 100 mL of the solution.

    i.e. Mass by Volume percentage =

    (Mass of solute in grams/Volume of solution in mL) x 100

    1.135 g  in 608 g H2O

    Mass %= mass of solute /mass of solution*100

                  =1.135/600*100

                   =0.19 %

    30.3mg KNO3 in 9.72g 

    first let change mg to g

    30.3mg (1 g/1000mg)= .0303 g

     .0303 g  KNO3 in 9.72g H2O3

    Mass %= mass of solute /mass of solution*100

                  =.0303/9.72*100

                  = 0.312%

    8.00g C2H6O in 70.2g H2O 

    Mass %= mass of solute /mass of solution*100

                  = 8/70.2*100 

                 = 11.3 %

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  • 2 months ago

    1.

    (1.135 g) / (1.135 g + 608 g) = 0.00186 = 0.186% by mass

    2.

    (30.3 x 10^-3 g) / ((30.3 x 10^-3 g) + 9.72 g) = 0.00311 = 0.311% by mass

    3.

    (8.00 g) / (8.00 g +  70.2 g) = 0.102 = 10.2% by mass

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