The entropy values in J K^-1 mol^-1 of H2( g)=130.6, Cl2( g)=223 and HCl(g)=186.7 at 298 K and

step 1 The equation we are given an equation which states H2 in gaseous form plus CL2 in gaseous form f

The entropy values in J K^-1 mol^-1 of H2( g)=130.6,...

The entropy values in $\mathrm{J} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ of $\mathrm{H}_{2}(\mathrm{~g})=130.6$, $\mathrm{Cl}_{2}(\mathrm{~g})=223$ and $\mathrm{HCl}(\mathrm{g})=186.7$ at $298 \mathrm{~K}$ and 1 atm pressure. Then entropy change for the reaction: $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{HC} 1(\mathrm{~g})$ is (a) $+540.3$ (b) $+727.3$ (c) $-166.9$ (d) $+19.8$

The entropy values in $\mathrm{J} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ of $\mathrm{H}_{2}(\mathrm{~g})=130.6$,
$\mathrm{Cl}_{2}(\mathrm{~g})=223$ and $\mathrm{HCl}(\mathrm{g})=186.7$ at $298 \mathrm{~K}$ and
1 atm pressure. Then entropy change for the reaction:
$\mathrm{H}_{2}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{HC} 1(\mathrm{~g})$ is
(a) $+540.3$
(b) $+727.3$
(c) $-166.9$
(d) $+19.8$

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Key Concepts

Entropy Change in a Reaction

The entropy change for a chemical reaction is calculated by taking the sum of the standard molar entropies of the products (each multiplied by its stoichiometric coefficient) and subtracting the sum of the standard molar entropies of the reactants (each multiplied by its stoichiometric coefficient). This process reflects the overall change in molecular disorder that occurs during the reaction.

Standard Molar Entropy

This concept refers to the entropy content of one mole of a substance under standard conditions (typically 1 atm pressure and 298 K). It is a measure of the degree of molecular randomness or disorder in a substance and is used to compare the intrinsic entropic values of different compounds.

Stoichiometry in Thermodynamic Calculations

Stoichiometry plays a key role in thermodynamics when calculating properties such as entropy change, as it ensures that the contributions of each species to the overall property change are properly weighted according to the reaction's balanced equation. This allows for accurate assessment of how the distribution of energy and disorder changes from reactants to products.

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