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Integrated rate law equation for a first order gas phase reaction is given by (where P i is initial pressure and P t is total pressure at time t)

1. K = × t 303 . 2 log ( ) t i i P P 2 P 2 −
2. K = × t 303 . 2 log ( ) t i i P P 2 P −
3. K = × t 303 . 2 ( ) t i i P P 2 P −
4. K = × t 303 . 2 log ( ) i t i P P P 2 −

Correct answer: K = × t 303 . 2 log ( ) t i i P P 2 P −

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