Calculate the mass percent (m/m) of a solution prepared by dissolving 45.46 g of NaCl in 170.7 g of H2O. Express your answer to four significant figures.
Given:
Mass of NaCl = 45.46 g
Mass of solution = mass of NaCl + mass of H2O
= 45.46 g + 170.7 g
= 216.16 g
Use:
(m/m)% = mass of NaCl * 100 / mass of solution
= 45.46 * 100 / 216.16
= 21.03 %
Answer: 21.03 %
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