Answer:
Step-by-step explanation:
Think about the example of a mixture of salt water. The salt is a non-volatile ionic compound - this means it is very difficult to turn salt into a gas. It takes very high temps just to melt the salt.
The water is a volatile molecular compound which can be heated to the boiling point fairly easily. This leads to vaporization which turns the liquid water into steam.
So heating a solution of salt water allows you to separate the water from the salt.