chemical kinetics set 2

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Author:
ryansamona
ID:
195798
Filename:
chemical kinetics set 2
Updated:
2013-01-27 19:43:36
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chemistry
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Description:
kinetics
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  1. 2 NO (g) + O2 (g) ---> 2 NO2 (g)

    how do we get the instantaneous rate at t=2000s ?
    • 1) we use a graph of conc. vs. time
    • 2) we find 2000 s and mark it
    • 3) draw a tangent line
    • 4) pick 2 points on the tangent line
    • 5) derive a slope equation such that, for example: Δ[reactant] / Δ t
  2. For the reaction, 2 NO (g) + O2 (g) ---> 2 NO2 (g):

    which species can dictate the rate of the reaction?

    How can we convert 1 species rate to another species rate?
    the rate of a rxn is based on the species that has a coefficient of one.

    • Say we have NO's instantaneous rate of consumption to be -1.2 x 10-6 M/s.
    • We cannot use NO bc its coefficient is 2.  We can it convert though, to O2's rate.

    For example, if we have an instantaneous rate (t = 2000s) of NO (consumption), we can translate that to O2's rate:

    instantaneous rate of consumption of O2 = - (Δ[NO] / Δt) = - (-1.2 x 10-6 M/s) = 6.0 x 10-7 M/s
  3. 2 CO (g) + 2 NO (g) ---> N2 (g) + 2 CO2 (g)

    equate the rate of each species in this rxn
    rate = (Δ[N2] / Δt) = (Δ[CO2] / Δt) = - (Δ[CO] / Δt) = - (Δ[NO] / Δt)
  4. 2 CO (g) + 2 NO (g) ---> N2 (g) + 2 CO2 (g)

    Compare the rate of formation of N2 with the rate of consumption of CO
    (Δ[N2] / Δt) = - (Δ[CO] / Δ t)

    The rate of formation of N2 is one half the rate of consumption of CO
  5. 2 CO (g) + 2 NO (g) ---> N2 (g) + 2 CO2 (g)

    Compare the rate of formation of CO2 with the rate of consumption of NO
    (Δ[CO2] / Δt) = - (Δ[NO] / Δt)

    The rate of formation of CO2 is the same as the rate of consumption of NO
  6. N2O5 ---> NO2 + NO3


    With the help of a table or graph that indicates conc. of N2O5 vs. time, how can we get the average rate of consumption of N2O5?
    for the average rate of N2O5 consumption:

    Δ[N2O5] / Δt

    *for Δt, use a specific time interval (for avg. rate)

    For example:

    average rate = (Δ[N2O5]final - Δ[N2O5]inital) / (tfinal - tinital)

    this will give us the rate for the rxn (for the time interval stated) also because the coefficient for N2Ois one.

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