(a)
Interpretation:
The enthalpy of vaporization ΔHvap and the enthalpy of sublimation ΔHsubneed to be calculated from the given data
Concept Introduction:
Vaporization and sublimation are phase transition reactions which involve a change in the state of a substance from the liquid to the vapor/gas phase and from the solid to the gas phases respectively
Enthalpy changes associated with the reaction is essentially the amount of heat energy required for the phase transition. These are denoted as ΔHvapfor vaporization and ΔHsub for sublimation.
The relationship between pressure (P), temperature (T) and the enthalpy change ( ΔH) is given via the Clausius-Clapeyron equation:
Where R = 8.314 J/mol-K and C is a constant.
(b)
Interpretation:
The enthalpy of fusion ΔHfus for the solid needs to be calculated from the given data
Concept Introduction:
Fusion is a phase transition process which involves the change in state from solid to liquid.
The amount of heat energy required for the phase change or the melting process is referred to as the enthalpy of fusion ΔHfus
(c)
Interpretation:
The temperature and pressure at the triple point needs to be calculated
Concept Introduction:
Triple point is a
At the triple point:
vapor pressure of the solid = Vapor pressure of the liquid
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