Which one of the following quantities is generally not obtainable from a single heating or cooling curve of a substance, measured at atmospheric pressure?
A) melting point
B) boiling point
C) triple point
D) heat of fusion
E) heat of vaporization

Question

Quizplus · Accepted Answer

The triple point is a specific combination of temperature and pressure at which a substance can exist in all three states (solid, liquid, and gas) simultaneously in equilibrium. It cannot be determined from a single heating or cooling curve at atmospheric pressure because it requires measurements at multiple pressures. The melting point (A), boiling point (B), heat of fusion (D), and heat of vaporization (E) can all be obtained from a single heating or cooling curve at atmospheric pressure.

Which One of the Following Quantities Is Generally Not Obtainable