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The half life time , t(1//2) for the fir...

The half life time , `t_(1//2)` for the first order decomposition of `NH_4NO_2` is 123 minutes at `15^@C` .
(a) What is the value of k ?
(b) How long will it take for 2 g of `NH_4NO_2` to decompose until 0.2 remains ?

Text Solution

Verified by Experts

(a) `t_(1//2)=123` min
`k=0.693/123=5.63xx10^(-3)"min"^(-1)`
(b) `t =2.303/klog.([A_0])/([A_t])`
`t =2.303/klog.([2])/([0.2])`
`t=2.303/(5.63xx10^(-3))=409min`
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