For the sublimation of iodine at 25C I2(s) yield I2(g) the values of H and G...
For the sublimation of iodine at 25C
I2(s) yield I2(g)
the values of H and G are, respectively, 62 kJ and 19 kJ. Estimate the temperature at which iodine sublimes. Assume H and S do not depend on temperature.
Homework Answers
Given,
For the sublimation reaction of iodine at 25°C
standard enthalpy, ΔH = 62 kJ = 62000 J
standard free energy ΔG = 19 kJ = 19000 J
T = 273.15 + 25 = 298.15 K
Using these values and below formula, calculate the standard entropy of 25°C
ΔG = ΔH-TΔS
19000 J = 62000 J - (298.15 K)ΔS
ΔS = (62000 -19000)J/(298.15)K
ΔS = 144.22 J/K
Calculate the temperature for the sublimation of iodine using following formula
T = ΔH/ΔS
T = (62000 J)/(144.22 J/K)
T = 429.9 K
T = 429.9-273.15 = 156.8°C
Temperature for sublimation of iodine = 156.8°C or 429.9 K
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