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CGP EDU Academic Team
Published on: August 14, 2026
When 5.1g of solid NH 4 HS is introduced into a two litre evacuated flask at 27 0 C, 20% of the solid decomposes into gaseous ammonia and hydrogen sulphide. TheKp for the reaction at 27 0 C is 
. Thevalue of is ____. (Integer answer) [Given R = 0.082 L atm K −1 mol −1 ]
Text Solution
Verified by ExpertsThe correct answer is:
6
(6)
moles of NH 4 HS initially taken = 
= 0.1 mol
volume of vessel= 2ℓ
NH 4 HS (s ) ⇌ NH 3(g) + H 2 S (g)
t = 0 0.1 mol
t = ∞ 0.1(1 − 0.2) 0.1 × 0.2 0.1 × 0.2
⇒ partial pressure of each component
= 0.246 atm
⇒ k P = P NH3 × P H2S = (0.246) 2 = 0.060516
= 6.05 × 10 −2
⇒ 6
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