Equilibrium Question 772

Question: A gaseous compound of molecular mass 82.1 dissociates on heating to 400 K as X2Y4(g)X2(g)+2Y2(g) The density of the equilibrium mixture at a pressure of 1 atm and temperature of 400K is 2.0gL1 . The percentage dissociation of the compound is

Options:

A) 12.5%

B) 48.5%

C) 90.1%

D) 25.0%

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Answer:

Correct Answer: A

Solution:

D=PMRT=1×82.10.0821×400=2.5gL1

d=2.0gL1 (given) α=Ddd(n1)=2.522(31)=0.125=12.5 %



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