5: Plot of log [R]0/[R] vs time for a
first order reaction
Slope =
/2 303
k
log ([R /[R])
0]
Time
0
226
4
222
88
2
86
Ra
He
Rn


Rate = k [Ra]
Decomposition of  N2O5  and N2O are some more examples of first
order reactions The initial concentration of N2O5  in the following first order reaction
N2O5(g) ® 2 NO2(g) + 1/2O2 (g) was 1 24 × 10–2 mol L–1 at 318 K