You have 4.0 g of solid A, 100.00 mL of water (100.0 g of water), and the total mass of solid A combined with 100.00 mL of water is found to be 104.0 g. What is the mass percent of A in this solution?
100% ==> 104g
x ==> 4g
x = 4*100%/104
x = 3.846 %
+33 
