Chemistry, 04.12.2019 01:31 feliciagraham14
At what temperature is the following reaction at equilibrium when all substances are at standard pressure?
assume that entropies and enthalpies of reaction do not vary with temperature.
pcl3(g) + cl2(g) pcl5(g) substance ∆hºf , kj mol–1 sº, j mol–1 k –1 pcl3(g) –288.7 311.6 cl2(g) 0 223.1 pcl5(g) –374.9 364.2 (a) 506 k (b) 1640 k (c) 1980 k (d) 4260 k
Answers: 1
gas = 
gas =
![\Delta H_{rxn}=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]](/tpl/images/0402/0173/db29b.png)
![\Delta H_{rxn}=[(1\times \Delta H_f_{(PCl_5)})]-[(1\times \Delta H_f_{(PCl_3)})+(1\times \Delta H_f_{(Cl_2)})]](/tpl/images/0402/0173/51848.png)
![=[1\times (-374.9 kJ/mol)]-[1\times (-288.7 kJ/mol)+1\times 0 kJ/mol]](/tpl/images/0402/0173/d01dc.png)
![\Delta S_{rxn}=\sum [n\times \Delta S_(product)]-\sum [n\times \Delta S_(reactant)]](/tpl/images/0402/0173/93994.png)
![\Delta S_{rxn}=[(1\times \Delta S_{(PCl_5)})]-[(1\times \Delta S_{(PCl_3)})+(1\times \Delta S_{(Cl_2)})]](/tpl/images/0402/0173/79ece.png)
![=[1\times 364.2 J/molK]-[1\times 311.6 J/mol K+1\times 223.1 J/mol K]](/tpl/images/0402/0173/813b0.png)
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At what temperature is the following reaction at equilibrium when all substances are at standard pre...
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