For the reaction of nitric oxide and oxygen to form nitrogen dioxide, the reaction begins with 12.0 g of nitric oxide and 12.0 g of oxygen at 25oC in a 10.0 L container. At equilibrium, the pressure in the container is 1148 mmHg, what is Kp?

Explanation:

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In this case, since the undergoing chemical reaction is:

The equilibrium expression in terms of pressures is:

Thus, for the initial conditions, we compute the initial pressures of both nitric oxide and oxygen:

Next, since the equilibrium pressure is 1148 mmHg or 1.51 atm, we can write:

Thus, the Kp turns out:

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