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anandghegde (1712)

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please explain the effect of addition of inert gas at constant pressure to the equilibrium
PCl5 = PCl3 + Cl2

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ashgirl (1434)

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AT CONSTANT VOLUME, ADDN OF INERT GASES DOES NOT CHANGE THE MOLAR CONC OF REACTANTS AND PRODUCTS. SO, EQULIBRIUM IS UNAFFECTED. BUT AT CONSTANT PRESSURE ADDN WILL INC THE VOL, SO MOLAR CONC WILL DECREASE SO THE DISSOCIATION INCREASES AND REACN PROCEEDS IN FORWARD DIRECTION.
 
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anandghegde (1712)

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BUT THE MOLAR CONCENTRATION OF REACTANTS AS WELL AS PRODUCTS FALL..... SO HOW DO I KNOW WHICH SIDE THE EQUILIBRIUM SHIFTS?

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haseeb2009 (47)

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right shift
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spideyunlimited (4185)

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whichever side has more moles, the reaction proceeds in that direction if pressure is increased.
here left side - one mole
right - 2 moles

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anandghegde (1712)

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not clear.... can u plz explain in detail

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haseeb2009 (47)

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there is only one mole in PCl5 and on the LHS there are 2 compounds hence 2 moles so right shift

as..........whichever side has more moles, the reaction proceeds in that direction if pressure is increased.
here left side - one mole
right - 2 moles
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anandghegde (1712)

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here pressure is constant

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haseeb2009 (47)

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oops


ANS:
On Adding inert gas at constant pressure the reaction instantly shifts in the Direction where the Gaseous stoichiometric coefficient is greater!
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anandghegde (1712)

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why?

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haseeb2009 (47)

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thats the theory part !

reasonat constant press. volume is increased and summation(ng) also increases.
at delta ng is greater than 0 then Q=kc/kp
to retain equilibrium Quotient increases.numerator increases ..products increase

hence fwd shift..

thats the best i can do......

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