Question

Determine the mass (in g) of each sucrose solution that con- tains 12 g of sucrose. (a) 4.1% sucrose by mass (b) 3.2% sucrose by mass (c) 12.5% sucrose by mass

Answer 1

a) Mass percent is the number of grams of solute per 100 g of solution .

so a solution with a concentration 0f 4.1 % sucrose by mass contains 4.1g of sucrose per 100 g of solution.

( each sucrose solution that contains 12 g of sucrose )  

    therefore our answer will be

     (100 g solution / 4.1 g sucrose) * 12 g sucrose = 293 g

simply   

= 293 g  

b) similarly , for 3.2 % sucrose by mass

  

c) 12.5 % sucrose by mass