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A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed.

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A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed.

(Given: log 2 = 0.3010, log 3 = 0.4771, log 4 = 0.6021)

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Dividing (i) equation (i) by (ii) 

20/t = 0.1250/0.6021

t = 96.3 min

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