Reaction stoichiometry, kinetics and thermodynamics ltbgt Nitrosyl chloride `(NOCl)`, is a yellow gas that is most commonly encountered as a decomposition product of aqua regia. It is toxic and irritating to the lungs. On heating `NOCl` decomposes as `2NOClrarr2NO+Cl_(2)`. The enthalpy change `(DeltaH)` for the formation of `1` mole of `Cl_(2)` by the decomposition of `NOCl` is `75.3KJ` between `100.K "to" 600K`. The standard entropies `(S^(@)_(298K))` of different species are as given below: `{:("Substance",NOCl,NO,Cl_(2)),(S_(298K)^(@),264,211,223):}` A gaseous mixture of `NO,Cl_(2)` and `NOCl` with partial pressures (in bar) `1.5,0.88` and `0.065` respectively was taken at `475K`. Deduce whether the net reaction will lead to increase in `NOCl` concentration.

Reaction stoichiometry, kinetics and thermodynamics ltbgt Nitrosyl chl

1.	Reaction stoichiometry, kinetics and thermodynamics ltbgt Nitrosyl chloride `(NOCl)`, is a yellow gas that is most commonly encountered as a decomposition product of aqua regia. It is toxic and irritating to the lungs. On heating `NOCl` decomposes as `2NOClrarr2NO+Cl_(2)`. The enthalpy change `(DeltaH)` for the formation of `1` mole of `Cl_(2)` by the decomposition of `NOCl` is `75.3KJ` between `100.K "to" 600K`. The standard entropies `(S^(@)_(298K))` of different species are as given below: `{:("Substance",NOCl,NO,Cl_(2)),(S_(298K)^(@),264,211,223):}` A gaseous mixture of `NO,Cl_(2)` and `NOCl` with partial pressures (in bar) `1.5,0.88` and `0.065` respectively was taken at `475K`. Deduce whether the net reaction will lead to increase in `NOCl` concentration.
Answer» Correct Answer - `K_(p) "at" 475K=0.67 "and" Q=((1.5)^(2)xx.88)/((0.065)^(2))=468.6`

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