The half- life of a first order reaction is 900 min at 820 k
Estimate its half- life at 720 k if the energy of activation of the reaction is 250 kJ `"mol"^(-1) (1.464 xx 10^(5) min)`

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Hint `: (k_(2))/(k_(1)) = ((t_(1//2))_(1))/(t_(1//2))_(2)`
Half- life period `-1.46xx 10^(5) min`

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