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Determine the value of the rate constant...

Determine the value of the rate constant for the elementary reaction:
`I_(2)(g)+H_(2)(g)rarr2HI(aq)`. Given that when `[I_(2)]` is `0.15M` and `[H_(2)]` is `0.2M`, the rate of reaction is `0.005 Ms^(-1)` at `298K`.

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