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The concentration of a reactant changes ...

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 :

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Rate `= (-Delta[R ])/(Delta t) = ([0.03 M-0.02M])/(25 min)`
`= 0.01//25 mol L^(-1) min^(-1)`
`= 0.4 xx 10^(-3) mol L^(-1) min^(-1)`
`= 0.4 xx 10^(-3) mol L^(-1) min^(-1) min//60 s`
`= 0.66 xx 10^(-5) mol L^(-1) s^(-1)`
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