Problem: Consider the following reaction: 2NO(g) + O 2(g) ⇌ 2NO2(g)A reaction mixture at 175 K initially contains 522 torr of NO and 421 torr of O2. At equilibrium, the total pressure in the reaction mixture is 748 torr. Calculate Kp at this temperature.

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We are being asked to calculate Kp for the given reaction:

2 NO(g) + O2(g)  2 NO2(g)


When dealing with equilibrium and Kp:

Kp → equilibrium units in terms of pressure
Kp is an equilibrium expression:

Kp=productsreactants

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


Given:         

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Problem Details

Consider the following reaction: 2NO(g) + O 2(g) ⇌ 2NO2(g)

A reaction mixture at 175 K initially contains 522 torr of NO and 421 torr of O2. At equilibrium, the total pressure in the reaction mixture is 748 torr. Calculate Kp at this temperature.

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