posted by JBS .
The concentration of sodium chloride in an aqueous solution that is 2.23 M and that has a density of
1.01 g/mL is __ % by mass.
concentration by mass..
mass NaCl=2.23*formulamassNaCl (per liter
2.23 x 58.443 = 130.33
mass is 1010g
but 12.9 is the right answer...
Look at Bob P's work. mass solution is 1010g, (you added 1010+130.33=1140.33 which isn't correct).
130.33/1010 = 12.9%
sorry, im used to adding together once you convert to grams...