mole cocept

Asked by  | 28th 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. nH2 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  | 30th Jun, 2009, 02:23: PM

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