Answer: please your question is not complete. I think this is the complete question you want to ask:
A solid substance has a vapor pressure of 100 mmHg at the melting point 100°c. Assuming an atmospheric pressure of 760 mmHg, describe the behavior of this solid as the temperature is raised from room temperature to its melting point.
ANSWER: THE SOLID SUBSTANCE WILL SHOW CASE STEP BY STEP TRANSITION OF STATE FROM SOLID TO LIQUID TO GAS ( THAT MEANS SUBLIMATION AND EVAPORATION WILL TAKE PLACE) on continues heating.
Explanation: the question here wants us to describe how this solid will behave if the temperature is raised from room temperature to 100°C, at a constant atmospheric pressure of 760mmHg.
In science, increase in temperature increase the state of a substance, therefore when the temperature of the substance is increased above the room temperature, all the molecules of the substancee begin to vibrate, and at the melting point of 100°c the solids changes to liquid, this is called SUBLIMATION.
on a continuous heating the liquids changes state, from liquid to vapour, this is called EVAPORATION.