Concept explainers
Determine the mass percent of anhydrous sodium carbonate
Interpretation:
Mass percentage of sodium carbonate and water must be calculated in sodium carbonate decahydrate.
Concept introduction:
1 molecule of sodium carbonate decahydrate contains 1 formula unit of sodium carbonate and 10 molecules of water.
Mass % of a species in a compound
Answer to Problem 180A
Percentage mass of Na2CO3 is 37.06% and percentage mass of water is 62.94%.
Explanation of Solution
Molar mass of Na2CO3.10 H2O is 286 g/mol.
Molar mass of Na2CO3 is 106 g/mol.
Molar mass of H2O is 18 g/mol.
Now, from total mass of hydrated salt, the mass percent of sodium carbonate and water can be calculated as follows:
Mass % of Na2CO3
Mass % of H2O
Thus, mass percentage of Na2CO3 and H2O are 37.06% and 62.94% respectively.
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Glencoe Chemistry: Matter and Change, Student Edition
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