For the reaction CS2(g)+3 O2(g) ⟶CO2(g)+2 SO2(g) ΔS^∘ is equal to -143 JK . Use this value and d

step 1 Hi guys, so in problem 52 we are asked to calculate the standard entropy of carbon disulfide in

For the reaction CS2(g)+3 O2(g) ⟶CO2(g)+2 SO2(g) ΔS^∘ is...

For the reaction
$$\mathrm{CS}_{2}(g)+3 \mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g)+2 \mathrm{SO}_{2}(g)$$
$\Delta S^{\circ}$ is equal to $-143 \mathrm{JK}$ . Use this value and data from Appendix 4 to calculate the value of $S^{\circ}$ for $\mathrm{CS}_{2}(g) .$

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Key Concepts

Standard Molar Entropy

Standard molar entropy is the measure of the absolute disorder or randomness in a substance, defined for one mole of a substance at a specified standard state (usually 1 bar pressure and 298 K). It provides a baseline value from which changes in entropy during chemical reactions can be calculated.

Entropy Change of Reaction

The entropy change for a chemical reaction (?S°) is determined by the difference between the total standard entropies of the products and that of the reactants, taking into account their stoichiometric coefficients. This concept forms the basis for predicting the spontaneity of a reaction and is governed by the equation: ?S° = ?(S° of products) - ?(S° of reactants).

Utilization of Tabulated Data

Tabulated standard entropy values, found in references such as Appendix tables, are used to calculate unknown standard entropies or reaction entropy changes. By inserting known entropy values into the reaction entropy equation, one can solve for the missing entropy value, linking experimental data with theoretical calculations.

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