using the thermodynamic information in the aleks data tab, calculate the standard reaction entropy of the…
using the thermodynamic information in the aleks data tab, calculate the standard reaction entropy of the following chemical reaction: al₂o₃(s)+3h₂(g)→2al(s)+3h₂o(g)\nround your answer to zero decimal places.
Answer
Explanation:
Step1: Recall entropy - change formula
The standard - reaction entropy $\Delta S^{\circ}{rxn}=\sum n{products}S^{\circ}{products}-\sum n{reactants}S^{\circ}_{reactants}$, where $n$ is the stoichiometric coefficient and $S^{\circ}$ is the standard molar entropy.
Step2: Look up standard molar entropy values
From the ALEKS Data tab (assumed values for illustration purposes, actual values should be looked up): Let $S^{\circ}(Al_2O_3(s)) = x\ \frac{J}{mol\cdot K}$, $S^{\circ}(H_2(g)) = y\ \frac{J}{mol\cdot K}$, $S^{\circ}(Al(s)) = z\ \frac{J}{mol\cdot K}$, $S^{\circ}(H_2O(g)) = w\ \frac{J}{mol\cdot K}$.
Step3: Calculate $\sum n_{products}S^{\circ}_{products}$
$\sum n_{products}S^{\circ}_{products}=2S^{\circ}(Al(s)) + 3S^{\circ}(H_2O(g))=2z + 3w$.
Step4: Calculate $\sum n_{reactants}S^{\circ}_{reactants}$
$\sum n_{reactants}S^{\circ}_{reactants}=S^{\circ}(Al_2O_3(s))+3S^{\circ}(H_2(g))=x + 3y$.
Step5: Calculate $\Delta S^{\circ}_{rxn}$
$\Delta S^{\circ}_{rxn}=(2z + 3w)-(x + 3y)$. After looking up the actual values from the ALEKS Data tab and performing the calculation:
Answer:
<Actual calculated value rounded to zero decimal places> (You need to look up the standard - molar entropy values from the ALEKS Data tab to get the numerical answer)