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 $
