A 10.0mL sample of NaCl solution has a mass of 10.416g. When the solution is evaporated to dryness,the solid?

NaCl remaining has a mass of 0.724g. What was the mass % of NaCl in the solution?

Answer:
Mass percent can be found by dividing the mass of the solute, which in this case is NaCl, by the mass of the solution. Since the NaCl remaining has a mass of .724 g, and the mass of the solution is 10.416 g, the mass percent would be .724g/10.416g, which is about 6.95%. The fact that the solution has a volume of 10 mL is unnecessary to know in order to solve this problem.
6.95%

Just divide 0.724 by 10.416, the total. Then convert the decimal 0.0695 to percent.
% mass NaCl = mass NaCl / total mass * 100%
% mass NaCl = 0.724g / 10.416g * 100%
% mass NaCl = 0.0695g * 100%
% mass NaCl = 6.95%
72.4/10.416

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