Solutions Question 303
Question: Formation of a solution from two components can be considered as
(i) Pure solvent $ \to $ separated solvent molecules, $ \Delta H_1 $ (ii) Pure solute $ \to $ separated solute molecules, $ \Delta H_2 $ (iii) Separated solvent and solute molecules $ \to $ Solution, $ \Delta H_3 $ Solution so formed will be ideal if
Options:
A) $ \Delta {H_{soln}}=\Delta H_3-\Delta H_1-\Delta H_2 $
B) $ \Delta {H_{soln}}=\Delta H_1+\Delta H_2+\Delta H_3 $
C) $ \Delta {H_{soln}}=\Delta H_1+\Delta H_2-\Delta H_3 $
D) $ \Delta {H_{soln}}=\Delta H_1-\Delta H_2-\Delta H_3 $
Show Answer
Answer:
Correct Answer: B
Solution:
For an ideal solution, $ \Delta H_{mixing}=0 $
$ \Delta H=\Delta H_1+\Delta H_2+\Delta H_3 $ (According to Hess’s law) i.e., for ideal solutions there is no change in magnitude of the attractive forces in the two components present.
