# A sample of solid NH4NO3 was placed in an evacuated container and then heated so that it decomposed explosively according to the following equation:NH4NO3(s)  N2O(g) + 2H2O(g)At equilibrium the total pressure in the container was found to be 2.63 atm at a temperature of 500.°C. Calculate Kp. a2.70 b72.8 c0.674 d1.54 e0.769

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A sample of solid NH4NO3 was placed in an evacuated container and then heated so that it decomposed explosively according to the following equation:
NH4NO3(s)  N2O(g) + 2H2O(g)
At equilibrium the total pressure in the container was found to be 2.63 atm at a temperature of 500.°C. Calculate Kp.
 a 2.7 b 72.8 c 0.674 d 1.54 e 0.769

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Step 1

A sample of solid NH4NO3 was placed in an evacuated container and then heated so that it decomposed explosively according to the following equation:
NH4NO3(s) → N2O(g) + 2H2O(g)
At equilibrium the total pressure in the container was found to be 2.63 atm at a temperature of 500.°C. The Kp is to be calculated.

Step 2

Kp is the equilibrium constant that is equal to the ratio of product and reactant partial pressures (P) at equilibrium.

Note: Partial pressures don’t apply to solids and liquids.

Step 3

Set up the ICE table and write the expression of KP for the given reaction.

Initial pressure of NH4NO3 (s) = 0

 NH4NO3 (s) N2O(g)     + 2H2O(g) I (atm) 0 0 0 C(atm) 0 +x +2x E(atm) 0 x 2x

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### Equilibrium Concepts 