Question #fb0be

1 Answer
Simon Moore
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 #(3.26/58.44) / (15/1000) = 0.056 / 0.015 = 3.73M#

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