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NCERT Class XI Chemistry Equilibrium Solutions

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Question : 11
Total: 73
A sample of HI(g) is placed in flask at pressure of 0.2 atm. At equilibrium the partial pressure of HI(g) is 0.04 atm. What is Kp for the given equilibrium?
2HI(g) ⇌ H2(g)+I2(g)
Solution:  
2HI(g) ⇌ H2(g)+I2(g)
Initial‌pressure0.2‌atm00
Pressure‌at‌eqm.0.04‌atm
0.16
2
=0.08‌atm
0.16
2
=0.08‌atm

According to law of chemical equilibrium,
Kp =
pH2×pI2
pHI2
 =
0.08×0.08
(0.04)2
 =
0.0064
0.0016
 = 4
∴ Kp = 4
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