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(Solved): Consider the following reaction at \( 298 \mathrm{~K} \). \[ 4 \mathrm{Al}(\mathrm{s})+3 \mathrm{O} ...




Consider the following reaction at \( 298 \mathrm{~K} \).
\[
4 \mathrm{Al}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{~g}) \longrig
Use the data from this table of thermodynamic properties to calculate the values of \( \Delta S_{\text {ixn }}^{*} \) for eac
Consider the following reaction at \( 298 \mathrm{~K} \). \[ 4 \mathrm{Al}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{Al}_{2} \mathrm{O}_{3}(\mathrm{~s}) \quad \Delta H^{*}=-3351.4 \mathrm{~kJ} \] Calculate the following quantities. Refer to the standard entropy values as needed. Use the data from this table of thermodynamic properties to calculate the values of \( \Delta S_{\text {ixn }}^{*} \) for each of the reactions at \( 25^{\circ} \mathrm{C} \). \[ \mathrm{C}(\mathrm{s} \text {, graphite })+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \longrightarrow \mathrm{CO}(\mathrm{g})+\mathrm{H}_{2}(\mathrm{~g}) \] \[ \Delta S_{\mathrm{fKn}}^{*} \] \[ \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{~g}) \]


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Solution : (i) Ssys = np*S0(each product) - nr*S0(each reactant) S0 Al = 28.3 J/K.mol S0 O2 = 205 J/K.mol S0 Al2O3 = 50.9 J/K.mol Ssys = 2*50.9 J/K.mo
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