The half life of a substance in a certain enzyme catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L−1 to 0.04 mg L−1 is The half life of a substance in a certain enzyme catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L−1 to 0.04 mg L−1 is June 26, 2021 Category: Chapter 17 - Chemical Kinetics , Chemistry , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Facebook Messenger WhatsApp Share this:TwitterFacebook Related