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Sir while solving ,plz tell me each term of formula being applied here and the calculations .

Asked by vishakhachandan026 | 16 Aug, 2019, 07:47: PM
Expert Answer
Correct option is (2)
 
Given:
 
Initial vapour density of PCl= 104.25
 
Vapor density at equilibrium = 60
 
Equilibrium equation is given as,
 
space space space space space space space space space space space space space space space space space space PCl subscript 5 space rightwards harpoon over leftwards harpoon space PCl subscript 3 space space plus space space Cl subscript 2
Initial space conc. space space space straight c space space space space space space space space space space space 0 space space space space space space space space space space space 0

at space equm space space space space straight c open parentheses 1 minus straight alpha close parentheses space space space space space cα space space space space space space space space cα
 
Total no. of moles = c(1−α) + cα + cα
 
                           = c(1+α)
 
We know,
 
fraction numerator No. space of space moles space at space equilibrium over denominator Initial space moles end fraction space equals space fraction numerator Initial space vapour space density over denominator Vapour space density space at space equilibrium end fraction

fraction numerator straight c open parentheses 1 plus straight alpha close parentheses over denominator straight c end fraction space equals fraction numerator 104.25 over denominator 60 end fraction

open parentheses 1 plus straight alpha close parentheses space equals space 1.74

space space space space space space space straight alpha space space equals space 0.74
 
Degree of dissociation is 0.74
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