Question

What is heat of vaporization?

A.
It is the heat required to change a substance’s temperature by 1°C.
B.
It is the heat required to change a gram of substance from a solid to a liquid.
C.
It is the heat required to change a substance from a solid directly to a gas.
D.
It is the heat required to change a gram of substance from a liquid to a gas.
E.
It is the heat required to separate one substance into two substances.

Answer 1

D.

Step-by-step explanation:

The heat of evaporation, is the amount of energy that must be added to a liquid substance, to transform a quantity of that substance into a gas. The heat of vaporization is a function of the pressure at which that transformation takes place.

Answer 2

D.

It is the heat required to change a gram of substance from a liquid to a gas.