A mixture of SO 3 , SO 2 and O 2 gases is maintained at equilibrium in 10 litre flask at a temperature at which K C for the reaction, 2SO 2 (g) + O 2 (g) 
2SO 3 (g) is 100 mol –1 litre. At equilibrium.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
0.1 0.4
2SO 2 (g) + O 2 (g) 
2SO 3 (g) K C = 100 mole –1 lit.
Initial mole a b 0
a–2x b–x 2x
b – 
(According to data given)
But according to question.
No. of mole of SO 2 = No. of mole of SO 3 .
= a – 2x = 2x.
a = 4x.
x = 
.
Now, K C = 
But No. of mole of SO 3 and SO 2 are equal at eq. so.
K C = 
[O 2 ] = 
; [O 2 ] = 
.
But [O 2 ] = 
= 
.
So No. of mole of O 2 = 
= 0.1.
K C = 
= 
K C = 
; .
= 
= 
= 0.4.
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