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SpinzTronics
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Homework Statement
Consider the decomposition of N2O5:
1. N2O5 → NO2 + NO3
2. NO2 + NO3 → NO2 + O2 + NO
3. NO + N2O5 → 3NO2
a) Find the reaction for the decomposition of N2O5 to stable products
b) Find the steady-state concentration of the intermediate(s)
c) Use the previous to show how the rate of reaction depends on the concentration of N2O5
Homework Equations
First I made the following forward and reverse reactions using k1, k2 and k3:
1. N2O5 → NO2 + NO3 using k1 forward
NO2 + NO3→ N2O5 using k-1 reverse
2. NO2 + NO3 → NO2 + O2 + NO with k2
3. NO + N2O5 → 3NO2 with k3
The Attempt at a Solution
a) -d[N2O5]/dt = k1[N2O5] - (k-1)[NO2][NO3]
b)The intermediates are NO and NO3
d[NO]/dt = 0= -k3[NO][N2O5]+k2[NO2][NO3]
=> simplifies to [NO] = (k2/k3)([NO2][NO3]/[N2O5])
d[NO3]/dt = 0= -k2[NO2][NO3]+k1[N2O5]-(k-1)[NO2][NO3]
=> simplifies to [NO3] = (-k1/(-k2-(k-1)))*[N2O5]/[NO2]
c) from the last expression, it is possible to have [NO3][NO2]= (-k1/(-k2-(k-1)))*[N2O5]
So, I substituted this for [NO3][NO2] in the overall reaction decomposition of N2O5 (part a):
R= k1[N2O5] -(k-1)[-k1/(-k2-(k-1))*[N2O5]] = (k1+((K-1)k1)/(-k2-(k-1)))*[N2O5] ~ keff[N2O5]
But isn't k3 supposed to be included in the overall reaction equation? Is this answer correct? Hope someone can help, thanks in advance!