Asolution was prepared by dissolving 26.0 g of kcl in 225 g of water. part a part complete calculate the mass percent of kcl in the solution.

10.4%  
First, calculate the total mass by adding the masses together.
 26.0 g + 225 g = 251 g 
 Now calculate the percentage of 251 that 26 is using division:
 26 / 251 = 0.103585657 = 10.3585657% 
 So the mass percent of KCl is 10.4% (after rounding to 3 significant digits)