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The first order rate constant for the de...

The first order rate constant for the decomposition of `CaCO_3` , at 700 K is `6.36 xx 10^(-3)s^(-1)` and activation energy is `209 "kJ mol"^(-1)` . Its rate constant (in `s^(-1)`) at 600 K is `"x" xx 10^(-6)` . The value of x is ______ .(Nearest integer)
[Given `R=8.31 J K^(-1) "mol"^(-1) , log 6.36 xx 10^(-3)= -2.19, 10^(-4.79)= 1.62 xx10^(-5)` ]

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