0.8mole/L is concentration of N2O5.
As the reaction is first order ,
so the order with respect to N2O5 is 1.
general,
Rate of equation is written as
rate = k [N2O5]^1
k is the rate constant = 3 * 10 ^ - 5 * S ^ - 1
rate = 2.4*10^-5 mole/L
N2O5 is concentration term
2.4*10^-5 mole/L = 3 * 10 ^ - 5 * S ^ - 1 [ N2O5]
N2O5 = [0.8 mole/L]
=0.8mole/L
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