Equilibrium Question 582

Question: Some solid $ NH_4HS $ is placed in a flask containing 0.5 atm of $ NH_3 $ , what would be pressures of $ NH_3 $ and $ H_2S $ when equilibrium is reached $ NH_4H{S_{(g)}} $ ⇌ $ N{H_{3(g)}}+H_2{S_{(g)}} $ , $ K_{p}=0.11 $ [UPSEAT 2001]

Options:

A) 6.65 atm

B) 0.665 atm

C) 0.0665 atm

D) 66.5 atm

Show Answer

Answer:

Correct Answer: B

Solution:

$ K_{p}=\frac{p^{2}}{4};0.11=\frac{p^{2}}{4}\Rightarrow p^{2}=0.44 $ or $ p=\sqrt{0.44}=0.66444\approx ,0.665,atm $



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