A first order reaction is 50% completed in 1.26×10^14s. How much time would it take for 100% completion ? A first order reaction is 50% completed in 1.26×10^14s. How much time would it take for 100% completion ? June 3, 2021 Category: Chemistry , NCERT Exemplar Class 11 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related