Chapter 25, Problem 42PS

(a)

Interpretation Introduction

Interpretation: Equation for phosphorus-32 decays by $\beta -$ particle emission has to be written.

Concept introduction:

In beta decay, there will be a lose of electron from nucleus (neutron turns into proton): there will be no change in mass number and atomic number increases by one.

(b)

Interpretation Introduction

Interpretation:

The remaining mass of phosphorus-32 isotope after 28.6days has to be calculated.

Concept introduction:

Half–life period: It is the time required for the reactant (substrate) concentration to reduce to the one-half of its initial concentration.