Homework Help: chemistry

Posted by pat on Friday, April 29, 2011 at 9:17am.

calculate the mass, in grams, of NaCl present in each of the following solutions.
6.25 g of 11.5% NaCl solution

452 g of 12.3% NaCl solution

please show me how to do these. Thanks.

chemistry - DrBob222, Friday, April 29, 2011 at 1:30pm
11.5% NaCl(w/w) means 11.5 g NaCl in 100 g soln.
11.5 g x 6.25g/100g = ??g in 6.25 g soln.
OR
(g solute/g soln)*100 = percent
(x g NaCl/6.25g soln)*100 = 11.5%
(x g NaCl/6.25 g soln) = 0.115
x g NaCl = 0.115 x 6.25 = ??

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