CBSE Class 11-science Answered
mole cocept
Asked by | 28 Jun, 2009, 03:08: PM
Expert Answer
Na2SO4. nH2O 
Na2SO4 + n H2O
(142 + 18n)g 142g 18n g
? 44.1 g 55.9 g
MM of Na2SO4. nH2O = (142 + 18n)g
MM of Na2SO4 =142g
MM of n H2O = 18n g
(142+ 18n)g of Na2SO4. nH2O 142g of Na2SO4
(142+ 18n) x 44.1 g of Na2SO4. nH2O 44.1 g of Na2SO4
142
Now, applying law of conservation of mass,
(142+ 18n) x 44.1 = 100 g
142
n = 10
Answered by | 30 Jun, 2009, 02:23: PM
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