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Example for sodium chloride, NaCl:

- Search the atomic weights of sodium and chlorine in atomic weight tables

Na = 22, 989 77; Cl = 34,968 85

- Calculate the molecular weight of NaCl: Na + Cl = 57, 958 62.

- Calculate the percentage of sodium:

57,95862 g NaCl------------22,98977 g Na

100 g NaCl--------------------x g Na

x=22,98977.1oo/57,95862 = 39,66583 %

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Q: How do you find sodium percentage in a compound?
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