CHEM

posted by K

how do I work this question out?:

50.00g of NaCl are dissolved in water to give a solution that contains 2.500% NaCl by mass. The density of the solution is 1.030g/mL. The volume of the solution is: a)941.8mL; b)1.942L; c)2.500L; and, d)50.0mL.
I know the answer is "b"->1.942L...but how is it worked out?
Please help. Thank you.

(massNaCl/totalmass)*100=2.5%
(50/x)=0.25
x=2000 grams total mass of solution.

mass = volume*density and
volume = m/d = 2000/1.030 = ??

You may have seen an earlier post (not here now) but I went for a walk, thought about the problem, and realized I had made a mental error. The above is the correct way to work the problem.

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