Problem: When 0.60 mol NH 3 is decomposed in a 1 Liter flask at 850 K, the equilibrium concentration of NH3 is measured as 0.12 M. Given that ammonia decomposes according to the reaction 2 NH3(g) ⇌ N2(g) + 3 H2(g), what is Kc for the reaction?a. 0.16b. 12.00c. 1.44d. 6.22e. 0.75

FREE Expert Solution

We are being asked to calculate the equilibrium constant, Kc for the given equilibrium reaction:

2 NH3(g) ⇌ N2(g) + 3 H2(g)


When dealing with equilibrium and Kc:

Kc → equilibrium units are in molarity 
Kc is an equilibrium expression:

Kc=productsreactants

only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression


Given:    

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Problem Details

When 0.60 mol NH 3 is decomposed in a 1 Liter flask at 850 K, the equilibrium concentration of NH3 is measured as 0.12 M. Given that ammonia decomposes according to the reaction 2 NH3(g) ⇌ N2(g) + 3 H2(g), what is Kc for the reaction?

a. 0.16
b. 12.00
c. 1.44
d. 6.22
e. 0.75