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14/01/2022 3:41 pm
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When 5.1 g of solid NH4HS is introduced into a two litre evacuated flask at 27°C, 20% of the solid decomposes into gaseous ammonia and hydrogen sulphide. The Kp for the reaction at 27°C is x × 10-2. The value of x is _______. (Integer answer)
[Given R = 0.082 L atm K-1 mol-1]
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14/01/2022 3:49 pm
moles of NH4HS initially taken = \(\frac{5.1g}{51g/mol}\)
= 0.1 mol
volume of vessel = 2ℓ
NH4HS ⇌ NH3(g) + H2S(g)
t = 0 0.1 mol
t = ∞ 0.1(1 - 0.2) 0.1 x 0.2 0.1 x 0.2
⇒ partial pressure of each component
P = \(\frac{nRT}{V}\) = \(\frac{0.1 \times 0.2 \times 0.082 \times 300}{2}\)
= 0.246 atm
⇒ Kp = PNH3 x PH2S
= (0.246)2 = 0.060516
= 6.05 x 10-2
= 6