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NaCl has a molar mass of 22,989 769 28 + 35,453 = 58,442 769 28 g

Na has an atomic weight of 22,989 769 28 g.

% Na = 22,989 769 28 ÷ 58,442 769 28 = 39,337

200 mL of 0,45 % sodium chloride contain 0,9 g NaCl.

Mass of Na in 0,9 grams of NaCl = 0,39337 x 0,9 g = 0,354 g

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