The concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes . The average rate of reaction using time in seconds is :

Options

A. `0.4xx10^(-3) "mol L"^(-1) s^(-1)`
B. `0.024 "mol" L^(-1)s^(-1)`
C. `0.24 "mol " L^(-1)s^(-1)`
D. `0.66xx10^(-4) "mol"L^(-1) s^(-1)` .

Answer

D

Explanation

(D) Rate `=-(Delta[R])/(Deltat)=(-(0.02-0.-03))/(24"min")`
`=0.4 xx10^(-3) "mol L"^(-1) min^(-1)`
`=0.4xx10^(-3) "mol L"L^(-1) min^(-1) `min /60 s
`=0.66 xx10^(-4) "mol L"^(-1) s^(-1)`