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In CuSO4.5H2O, what is the percentage of H2O?

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spsaroj | Student, Grade 10 | Honors

Posted June 23, 2013 at 1:00 AM via web

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In CuSO4.5H2O, what is the percentage of H2O?

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llltkl | College Teacher | Valedictorian

Posted June 23, 2013 at 1:52 AM (Answer #1)

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Molar mass is the mass of one mole of a substance and is ontained by adding atomic mases of all the constituent atoms and group of atoms.

Atomic masses: Cu = 63.55 g/mol,
S = 32.07 g/mol
O x 4 = 16.00 g/mol x 4 = 64.00 g/mol
H = 1.008 g/mol,

So, H2O = (2*1.008+16.00)*5 = 90.10 g/mol

Molar mass of CuSO4,5H2O = 249.72 g/mol.

Out of that 249.72 grams, 90.10 grams is water,

So, percentage by mass of water in CuSO4,5H2O

= 90.10*100/249.72 = 36.08.

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