The number of atoms left after 42.0 min is to be determined with given half-life and number of atoms. Concept introduction: The half-life of a reaction is defined as the time taken by the reactant concentration to decrease up to its half of its initial concentration. It is represented by t 1 / 2 . The numbers of elements present for 10 half-lives can be calculated by the expression: Numbers of atoms left = number of atoms initially present × ( 1 2 ) 10

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Chapter 20, Problem 27QP

Interpretation Introduction

Interpretation:

The number of atoms left after 42.0 min is to be determined with given half-life and number of atoms.

Concept introduction:

The half-life of a reaction is defined as the time taken by the reactant concentration to decrease up to its half of its initial concentration. It is represented by t1/2.

The numbers of elements present for 10 half-lives can be calculated by the expression: Numbers of atoms left = number of atoms initially present ×(12)10

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