hat is the percentage of water in the following compound? Answer using three significant figures. Sodium carbonate decahydrate, Na2CO3 • 10H2O
1 answer:
You need to find the whole molar mass of the compound using the periodic table to add the values. Na2CO3= (2 x 23.0) + 12.0 + (3 x 16.0)= 106 g/mol H2O= 10 x [ (2 x 1.01 ) + (16.0) ]= 180.2 g/mol the total molar mass is 106 + 180.2 = 286.2 g/mol the percentage of water you can find by doing "parts over the whole" H2O%= 180.2 / 286.2 X 100= 63.0%
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