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  • The observed osmotic pressure for a 0.10 M solution of Fe(NH4)2(SO4)2 at 250C is 10.8 atm. The expected and experimental (observed) values of

The observed osmotic pressure for a 0.10 M solution of Fe(NH4)2(SO4)2 at 250C is 10.8 atm. The expected and experimental (observed) values of Van’t Hoff factor (i) will be respectively :

 (R=0.082L\; atm\; k^{-}\; mol^{-1})

Option: 1

5 and 4.42
 


Option: 2

 4 and 4.00


Option: 3

 5 and 3.42

 


Option: 4

 3 and 5.42


Answers (1)

best_answer

As learnt in 

F_{e} (NH_{4})_{2} (SO_{4})_{2}\rightarrow F_{e}^{2+}2NH_{4}^{+}+2SO_{4}^{2-}

Theoretically, we know that \pi =iCRT

\Delta i=\frac{\pi }{cRT}

=\frac{10.8}{0.1\times 0.082\times 298}

= 4.42

observed i = 4.42

 

Posted by

jitender.kumar

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