1.

The half life of a subs†an ce in a certain is 138s . The time required for the concentration of the subs†an ce to fall from 1.28mg l to 0.04 mg l is

Answer» The half life of a subs†an ce in a certain is 138s . The time required for the concentration of the subs†an ce to fall from 1.28mg l to 0.04 mg l is


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