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75% of the first order reaction is compl...

`75%` of the first order reaction is completed in 30 minutes. Calculate rate constant of the reaction.

Text Solution

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Given : `t="30 min, "[R]_(0)=100, [R]=25, K=?`
`K=(2.303)/(t)log""([R]_(0))/([R])`
`K=(2.303)/(30)log""(100)/(25)=0.076 7xxlog4=0.0767xx0.6021="0.0462 min"^(-1)`
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