[torturedillini]

I'm having trouble understanding the difference between volatile and nonvolatile solutions. In particular, I don't understand this question at all.

Which of the following solutions of two volatile liquids is expected to behave most ideally?
a) Hexane and octane
b) Ethanol and carbon tetrachloride
c) Acetone (propanone) and water
d) Ethanol and hexane

[Loyal]

Volatile solutions are ones that vaporize readily at room temperature. 

[typhoon2028]

You start by evaluating each component in solution.  How are they similar?  How are they different?  Similar materials should behave most ideally in solution.

[torturedillini]

Oh ok this is about polarity. So since hexane and octane are both nonpolar then my guess is A.

And its right! Thanks

[Loyal]

Oh ok this is about polarity. So since hexane and octane are both nonpolar then my guess is A.

And its right! Thanks

Although not always about polarity.   The more similar two molecules are in physical and chemical properties, the more ideal they are.   I think Benzene and Toluene were one of the most idea solutions.