Consider the sublimation of iodine at 25.0 °C: I2(s) → I2(g). a. ...

Question

Consider the sublimation of iodine at 25.0 °C: I2(s) → I2(g). a. Find ΔG°rxn at 25.0 °C.

Accepted Answer

Identify the relevant thermodynamic equation: $ \Delta G^\circ_{\text{rxn}} = \Delta H^\circ - T\Delta S^\circ $.. Look up the standard enthalpy change ($ \Delta H^\circ $) and the standard entropy change ($ \Delta S^\circ $) for the sublimation of iodine from a reliable source, such as a chemistry textbook or database.. Convert the temperature from Celsius to Kelvin by adding 273.15 to the Celsius temperature: $ T = 25.0 + 273.15 $.. Substitute the values of $ \Delta H^\circ $, $ T $ (in Kelvin), and $ \Delta S^\circ $ into the equation $ \Delta G^\circ_{\text{rxn}} = \Delta H^\circ - T\Delta S^\circ $.. Perform the calculation to find $ \Delta G^\circ_{\text{rxn}} $, ensuring that the units are consistent (e.g., convert $ \Delta S^\circ $ from J/mol·K to kJ/mol·K if necessary).