Reaction Rate of NO & O2 to Form NO2

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Discussion Overview

The discussion revolves around the reaction rate of nitrogen monoxide (NO) and oxygen (O2) forming nitrogen dioxide (NO2), specifically examining how changes in the concentrations of the reactants affect the reaction rate as described by the rate expression r = k [NO]² [O2]. The focus includes a homework problem regarding the increase in reaction rate when the concentrations of NO and O2 are altered.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant states that doubling the concentration of NO and tripling the concentration of O2 results in a reaction rate increase of 6 times.
  • Another participant challenges this claim, suggesting to first consider the effect of doubling the concentration of NO alone.
  • A subsequent reply calculates the reaction rate as 12 when applying the concentrations of 2*NO and 3*O2, indicating a different interpretation of the problem.
  • One participant asserts that the previous answer is correct but not relevant to the original question posed.
  • Another participant expresses frustration over the perceived disorganization in the responses, indicating difficulty in following the discussion.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct interpretation of the problem or the resulting reaction rate, with multiple competing views presented.

Contextual Notes

There are unresolved assumptions regarding the interpretation of the question and the application of the rate law, as well as potential confusion stemming from the responses provided.

chawki
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Homework Statement


The reaction rate of nitrogen monoxide and oxygen into nitrogen dioxide is given by the expression
r = k [NO]2 [O2],
where r = reaction rate
k = reaction rate coefficient, which increases with increasing temperature.

Homework Equations


What is the increase in the reaction rate when the concentration of nitrogen oxide is
doubled and the concentration of oxygen is tripled?

The Attempt at a Solution


it's obvious that it increases 6 times.
 
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chawki said:
it's obvious that it increases 6 times.

No.

Start with a simpler problem - what happens to the reaction rate when the concentration of nitrogen oxide is doubled?
 
Borek said:
No.

Start with a simpler problem - what happens to the reaction rate when the concentration of nitrogen oxide is doubled?

ok it will be:
4*3 = 12
because: r = k [2*NO]2 * 3[O2]
 
This is a correct answer, but not to the question I asked.

You are so chaotic it is impossible to help.
 

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