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 ?

Answer 1

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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Answer 2

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