5.3 Concentration Changes Over Time

In a previous example, the following reaction was determined to be 1^st order:     

  2N₂O₅(g) → 4NO₂(g) + O₂(g)

  If [N₂O₅]₀ = 0.010 M, and at t = 240 s, [N₂O₅] = 0.0035 M. 

Calculate t_½ for the reaction at this temperature.

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NGSS.HS-PS1-5

In a previous example, the following reaction was determined to be 1^st order:     

  2N₂O₅(g) → 4NO₂(g) + O₂(g)

  If [N₂O₅]₀ = 0.010 M, and at t = 240 s, [N₂O₅] = 0.0035 M. 

What time would be required for the [N₂O₅] = 1/32 its original concentration?

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NGSS.HS-PS1-5

What is the order of the reaction with respect to CO(NH₂)₂?

Justify your answer.

• zero order

• 1st order

• 2nd order

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NGSS.HS-PS1-5

2.Determine the value of the rate constant k for this decomposition reaction at 90_^oC.  Include units in your answer.

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NGSS.HS-PS1-5

3.Calculate the expected value for the concentration of CO(NH₂)₂ in this experiment after 35 hours are passed.

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NGSS.HS-PS1-5