The graph below represents a temperature versus energy plot for a pure substance. Identify the point(s)(i)where both liquid and gas exist and (ii)is associated with the heat of condensation

Question

The graph below represents a temperature versus energy plot for a pure substance.  Identify the point(s)(i)where both liquid and gas exist and (ii)is associated with the heat of condensation

Quizplus · Accepted Answer

(i) The point where both liquid and gas exist, also known as the boiling point, is where the temperature is constant while energy is being added or removed. In this case, it occurs at points 5 and 6, where there is a plateau in the temperature curve indicating a phase change. 
(ii) The heat of condensation is the energy released when a gas condenses into a liquid. This occurs at the same point where both liquid and gas exist, i.e. at points 5 and 6. Therefore, the best choice is D.

The Graph Below Represents a Temperature Versus Energy Plot for a Pure