The vapor pressure of a substance, at its melting point, is _____________ in the solid state as compared to that in the liquid state?
Correct answer: C. Same
- A. Less
- B. More
- C. Same
- D. Either A. or B.; depends on the nature of the substance
Explanation
At the melting point, solid and liquid coexist in equilibrium, so their fugacities and vapour pressures are equal. The difference in vapour pressure between the phases disappears at this equilibrium point.
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