Ammonia reacts with O2 problem

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In summary, the conversation discusses a reaction between ammonia and oxygen to form either NO or NO2. In a specific experiment, 2.00 moles of NH3 and 10.00 moles of O2 are present in a closed flask, and after the reaction is complete, 6.75 moles of O2 remain. The problem asks for the number of moles of NO in the product mixture, but it is mentioned that the balanced equations cannot be used since the reactions may not occur with equal probability. By using the given information, it is determined that the number of moles of NO is 0.5, which is slightly different from the solution manual's answer of 0.48.
  • #1
skepticwulf
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Homework Statement


Ammonia reacts with O2 to form either NO(g) or NO2(g) according to these unbalanced equations:
NH3 + O2 ----> NO + H2O
NH3 + O2 ----> NO2 + H2O
In a certain experiment 2.00 moles of NH3 and 10.00 moles
of O2 are contained in a closed flask. After the reaction is
complete, 6.75 moles of O2 remains. Calculate the number
of moles of NO in the product mixture: (Hint: You cannot
do this problem by adding the balanced equations because you
cannot assume that the two reactions will occur with equal
probability.)

Homework Equations



The Attempt at a Solution


After the balance of equations,
x=mol of NH3 in the first equations(=mol of NO as well)

1st reaction:
2 mol NH3 gives 5/2 mole O2
x mol gives ... 5x/4 mole O2

2nd reaction:
2 mol NH3 gives 7/2 mole O2
(2-x) mol gives ... 7(2-x)/4 mole O2

5x/4 + 7(2-x)/4 + 6.75=10
I find: x=0.5 mole of NH3 as well as 0.5 mole of NO
But solution manual has 0.48 as answer, is my calculation wrong in any way??
 
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  • #2
Any particular reason to not write balanced reaction equations and to make us guess whether you had them right or wrong?

Ammonia doesn't "give" oxygen, it reacts with oxygen consuming it.

But in general 0.5 moles of NO look correct.
 
  • #3
No, no particular reason :)

2 NH3 + 5/2 O2 ----> 2NO + 3H2O
2 NH3 + 7/2 O2 ----> 2NO2 + 3H2O
 
  • #4
Thank you both! :)
 

Related to Ammonia reacts with O2 problem

1. What is the equation for the reaction between ammonia and oxygen?

The equation for the reaction between ammonia and oxygen is 4NH3 + 5O2 → 4NO + 6H2O.

2. What is the purpose of the reaction between ammonia and oxygen?

The purpose of the reaction between ammonia and oxygen is to produce nitric oxide (NO), which is an important intermediate in the production of fertilizers, explosives, and other chemical compounds.

3. What are the conditions necessary for the reaction between ammonia and oxygen to occur?

The reaction between ammonia and oxygen requires a high temperature (around 2000°C) and a catalyst, such as platinum or iron, to proceed at a reasonable rate.

4. What are the products of the reaction between ammonia and oxygen?

The products of the reaction between ammonia and oxygen are nitric oxide (NO) and water (H2O).

5. How is the reaction between ammonia and oxygen used in industrial processes?

The reaction between ammonia and oxygen is used in the production of nitric acid, which is an important component in the manufacture of fertilizers, explosives, and other chemical compounds. It is also used in the production of synthetic fibers and plastics.

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