Solid iodine, I 2 (s), at 25 0C has an enthalpy of sublimation of 56 30 kJ mol 1 The C P,m of the vapor and solid phases at that temperature are 36 9 and 54 4 J K 1 mol 1 , respectively The sublimation pressure at 25 0C is 0 30844 Torr Calculate the sublimation pressure of the solid at the melting ...

a If the enthalpy of sublimation is constant b If th ...

Solid iodine, I 2 (s), at 25.0C has an enthalpy of sublimation of 56.30 kJ mol 1

Question:

Solid iodine, I₂(s), at 25.0°C has an enthalpy of sublimation of 56.30 kJ mol⁻¹. The C_P,m of the vapor and solid phases at that temperature are 36.9 and 54.4 J K⁻¹ mol⁻¹, respectively. The sublimation pressure at 25.0°C is 0.30844 Torr. Calculate the sublimation pressure of the solid at the melting point (113.6°C) assuming

a. that the enthalpy of sublimation and the heat capacities do not change with temperature.

b. that the enthalpy of sublimation at temperature T can be calculated from the equation ΔH _sublimation (T) (T)ΔH _sublimation = ΔH _sublimation (T₀) + ΔCP(T – T₀) and ΔC_P does not change with T.

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