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.
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