2N205(CC14)2N204(CC14)+O2(g) t1=0s c1N205)=0.200molL1 t2=300s c2N20s)=0.180molL1 D=-(0.1800,200mol-L=33×109mol-L2-s 2×300s 2.Instantaneous rate The instantaneous rate of a reaction is the limit of the average reaction rate. t1= 0 s c1(N2O5) = 0.200 mol·L-1 t2=300 s c2(N2O5) = 0.180 mol·L-1 5 1-1- -1 sLmol103.3 s3002 Lmol ⋅⋅×= × (0.180− − 0.200) ⋅ = − υ 2. Instantaneous rate The instantaneous rate of a reaction is the limit of the average reaction rate. 2N2O4 (CCl4) + O2 2N (g) 2O5(CCl4)