20.65%, 21.73% and 3.73M
The total mass of solution was 15.78 g, and the amount of NaCl that was dissolved in it was found to be 3.26 g.
The weight/weight percentage of NaCl is therefore
The weight/volume percentage of NaCl is
Molarity is the number of moles of NaCl per litre of solution. Molar mass of NaCl is 58.44 g/mol, so the molarity will be