(i) The rate constant of a reaction at 5OOK and 700K are 0.02 sec^-1 and 0.07 sec^-1 respectively. Calculate the value of E_a (activation energy)

(ii) A radioactive substance which emits alpha particle follows first order reaction.The half-life period of this radioactive substance is 30 hours. Calculate the fraction in percent(%) of the radioactive substance which remains after 90 hours.

Solution

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