Question

In: Chemistry

22. For which one of the following reactions is Kp equal to Kc? a. 4NH3(g) +...

22. For which one of the following reactions is Kp equal to Kc?

a. 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g)

b. C(s) + CO2(g) 2CO(g)

c. 6CO2(g) + 6H2O(l) C6H12O6(s) + 6O2(g)

d. CaCO3(s) CaO(s) + CO2(g)

e. H2O(g) + C(s) H2(g) + CO(g)

Expert Solution

Ans. Using the equation-

K_p = K_c (RT)^dn - equation 1

Where,

Kp = equilibrium constant in term of partial pressure

Kc = equilibrium constant in term of concentration

R = Universal gas constant= 0.0821 atm L mol^-1K^-1

T = temperature in kelvin

dn = total number of moles of product- total number of moles of reactants

Option A. dn = (6 + 4) – (4 + 5) = 1

Option B. dn = (2) – (1 + 1) = 0

Option C. dn = (1 + 1) – (1) = 1

Option D. dn = (1 + 1) – (1 + 1) = 0

Now, when dn = 0

K_p = K_c (RT)⁰

Or, Kp = Kc x 1 ; (X)⁰ = 1; so (RT)⁰ =1

Hence, Kp = Kc

So, for all reactions with dn = 0, Kp = Kc.

Correct option= B, E

queen_honey_blossom answered 2 years ago

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