Question

Use tabulated thermodynamic data to calculate the standard entropy change of each of the reactions listed below.

(a) Fe(s)+2HCl(g)FeCl2\mathrm{Fe}(\mathrm{s})+2 \mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{FeCl}_2 (s) +H2( g)+\mathrm{H}_2(\mathrm{~g})

(b) 3NO2( g)+H2O()2HNO3()+NO(g)3 \mathrm{NO}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\ell) \rightarrow 2 \mathrm{HNO}_3(\ell)+\mathrm{NO}(\mathrm{g})

(c) 2 K( s)+Cl2( g)2KCl(s)2 \mathrm{~K}(\mathrm{~s})+\mathrm{Cl}_2(\mathrm{~g}) \rightarrow 2 \mathrm{KCl}(\mathrm{s})

(d) Cl2( g)+2NO(g)2NOCl(g)\mathrm{Cl}_2(\mathrm{~g})+2 \mathrm{NO}(\mathrm{g}) \rightarrow 2 \mathrm{NOCl}(\mathrm{g})

(e) SiCl4( g)Si(s)+2Cl2( g)\mathrm{SiCl}_4(\mathrm{~g}) \rightarrow \mathrm{Si}(\mathrm{s})+2 \mathrm{Cl}_2(\mathrm{~g})

Solution

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Answered 2 years ago
Answered 2 years ago
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First we should look up values for standard molar entropy and use them in the equation below.

ΔS=ΣiviS(product)iΣjvjS(reactant)j\Delta S^{\circ} = \Sigma_{i} v_{i} S^{\circ} ( product)_{i} - \Sigma_{j} v_{j} S^{\circ} ( reactant)_{j}

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