Question

When ethanol mixes in cyclohexane reduces the intermolecular forces between ethanol molecule. In this, liquid pair shows:

• A. ${\Delta H}_{mix}>0$
• B. ${\Delta V}_{mix}<0$
• C. ${\Delta G}_{mix}<0$
• D. ${\Delta H}_{mix}=0$

Answer 1

The correct option is A ${\Delta H}_{mix}>0$

On adding cyclohexane to ethanol . Its molecules get in between the molecules of ethanol thus breaking the hydrogen bonds and reducing ethanol - ethanol interaction .

Thus will increase the vapour pressure of the solution and result in positive deviation from Rouault's law.