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Percentage Composition, Exams of Chemistry

Pennsylvania State University - York Chemistry

1 mol Cl molar mass NaCl = 58.44 g/mol. 22.99 g Na x 100 = 39.34 % Na. 58.44 g NaCl. Find the percentage composition of sodium nitrate.

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2021/2022

Uploaded on 09/12/2022

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Download Percentage Composition and more Exams Chemistry in PDF only on Docsity! Don’t forget to multiply mass by #of Moles Percentage Composition % Composition is the % by mass of each element in a compound. Ex: Find the percentage composition of sodium in sodium chloride: Na+ Cl - : formula is NaCl 1 mol Na x 22.99 g Na = 22.99 g Na 1 mol Na 1 mol Cl x 35.45 g Cl = 35.45 g Cl 1 mol Cl molar mass NaCl = 58.44 g/mol 22.99 g Na x 100 = 39.34 % Na 58.44 g NaCl Find the percentage composition of sodium nitrate. Na+ NO3 - : formula is NaNO3 1 mol Na x 22.99 g Na = 22.99 g Na 1 mol Na 1 mol N x 14.01 g N = 14.01 g N 1 mol N 3 mol O x 16.00 g O = 48.00 g O 1 mol O molar mass NaNO3 = 85.00 g/mol

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