Question

The half-life of a first order reaction is 24 hrs. If we start with 10 M initial concentration of the reactant then conc. after 96 hrs will be

• A. 6.25 M
• B. 1.25 M
• C. 0.125 M
• D. 0.625 M

Answer 1

The correct option is D 0.625 M

$10\stackrel{24hrs}{\to }5\stackrel{24hrs}{\to }2.5\stackrel{24hrs}{\to }1.25\stackrel{24hrs}{\to }0.625$