Problems
Calc the composition of the soln in W/V%:
   20.0g acetic acid in 2.50L sollution
Calc the W/W % of  31.0 g of KCl in 152 g
of water.
Calc the W/W% of 50.0 g KCl in 5.00 x 102
mL solution (d = 1.14g/mL)