The pressure during the molar heat of fusion is kept________________?
Correct answer: B. one atmosphere
- A. 0 atmosphere
- B. one atmosphere
- C. 2 atmosphere
- D. 10 atmosphere
Explanation
Molar heat of fusion is conventionally measured at constant atmospheric pressure, so the pressure is 1 atmosphere. Students may choose 0 atmosphere by confusing atmospheric pressure with a vacuum, but phase-change enthalpies are commonly specified at 1 atmosphere.
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About Enthalpy
Enthalpy is the heat content of a system measured at constant pressure, and its change indicates whether a reaction or physical process is endothermic or exothermic. The topic covers state functions, enthalpy diagrams, standard enthalpy of formation, combustion and neutralisation, and the relationship between ΔH and internal energy change.
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