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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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Don’t forget to multiply mass by #of Moles
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
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 NaNO 3 = 85.00 g/mol
Once you find molar mass, you are just dividing the part (element) by the whole (compound) to get the percent composition 22.99 g Na x 100 = 27.05 % Na 85.00 g NaNO 3
2.02 g H x 100 = 11.21 % H 18.02 g H 2 O