# Question fb0be

Apr 5, 2017

20.65%, 21.73% and 3.73M

#### Explanation:

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 (3.26/15.78). 100 = 20.65%

The weight/volume percentage of NaCl is (3.26/15.00).100 = 21.73%#

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 $\frac{\frac{3.26}{58.44}}{\frac{15}{1000}} = \frac{0.056}{0.015} = 3.73 M$