ANSWERS: 2
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you tell me....
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If the solution were pure water should weight 1 gram per ml, which would be 10.3 g. It's actual weight is greater because of the NaCl. How much greater? (11.1239 - 10.3) = 0.8239 g. This is dissolved in 10.3 ml making the final concentration: 0.8239/10.3 = 0.080 = 8.0% solution.
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