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is 25% dissociated at and one atmosphere pressure. Calculate and the percentage dissociation at atmosphere and .


0.166 atm and 37% respecively


0.266 atm and 87% respectively


0.316 atm and 47% respectively


0.316 atm and 37% respectively

Video Explanation


Let initially 1 mole of be present. Total pressure is 1 atm.

 Initial moles  
 Equilibrium moles  
The expression for the equilibrium constant is:
Now total pressure is 0.1 atm. 
Equilibrium moles are
Mole fraction are ,  
The expression for the equilibrium constant is . . Thus . Hence, the degree of dissociation is 87%.

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