Question
Asked Jan 21, 2020
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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
2.70
 b
72.8
 c
0.674
 d
1.54
 e
0.769
 
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Expert Answer

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.

Chemistry homework question answer, step 2, image 1
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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

 

...
Chemistry homework question answer, step 3, image 1
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Equilibrium Concepts

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