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Standard XII
Chemistry
Derivation of Kp and Kc
Question

For the reaction :
2NO2(g)⇌2NO(g)+O2(g),(Kc=1.8×10−6 at 184oC)(R=0.082Latm/(mol.K)

When Kp and Kc are compared at 184oC, it is found that

  1. Whether Kp is greater than, less than or equal to Kc depends upon the total gas pressure
  2. Kp=Kc
  3. Kp is less than Kc
  4. Kp is greater than Kc

A
Whether Kp is greater than, less than or equal to Kc depends upon the total gas pressure
B
Kp is greater than Kc
C
Kp=Kc
D
Kp is less than Kc
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Solution
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For the reaction :
2NO2(g)⇌2NO(g)+O2(g)

Given:
Kc=1.8×10−6 at 184oC

Δn=3−2=1

R=0.082Latm/mol.K

T=1840C=184+273=457K

Kp=Kc(RT)Δn

Kp=1.8×10−6×0.082×457=6.836×10−5

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(Kc=1.8 ×10−6 at 184oC
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