what is the mass percent concentration of a solution containing 28.0 gg naclnacl and 150.0 mlml of water? assume a density of 1.00 g/mlg/ml for water. what is the mass percent concentration of a solution containing 28.0 and 150.0 of water? assume a density of 1.00 for water. 15.7 %% 0.319 %% 5.36 %% 18.7 %%