Solutions Question 344

Question: The observed osmotic pressure for a 0.10 M solution of $ Fe{{(NH_4)}_2}{{(SO_4)}_2},at,25{}^\circ C $ is 10.8 atm. The experimental (observed) value of van’t Hoff factor will be: $ ( R=0.082Latm{k^{-1}}mo{l^{-1}} ) $

Options:

A) 4.42

B) 4.00

C) 3.42

D) 5.42

Show Answer

Answer:

Correct Answer: A

Solution:

Given $ {\pi_{ob}}=10.8atm $

$ {\pi_{nor}}=CRT=0.10\times 0.0821\times 298=2.446 $ now experimental value of (i) $ =\frac{Observedosmoticpressure}{Normalosmoticpressure} $

$ =\frac{10.8}{2.446}=4.42 $



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