Published by:
CGP EDU Academic Team
Published on: August 13, 2026
When sulphur in the form of S 8 (g) is heated at 900 K, the initial partial pressure of S 8 (g) which was 1 atm falls by 29% at equilibrium. This is because of conversion of some S 8 (g) to S 2 (g). Find the K p for reaction, S 8 (g) 
4S 2 (g).
Text Solution
Verified by ExpertsThe correct answer is:
2
(2.55 atm 3 )
S 8 (g) 
4S 2 (g)
time t = 0 1atm 0
At. eq. (1–x) 4x
Pressure of eq. 1 – 0.29 4 × 0.29.
K P = 
= 
.
K P = 2.55 atm 3 .
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