Chapter 5, Problem 5.108P

(a)

Interpretation Introduction

Interpretation:

The different molecular masses in amu should be determined which can be found for ${\text{PCl}}_3$ .

Concept Introduction: isotopes of an element have different number of neutrons but same number of protons in every atom.

Molecular mass of a compound is equal to the addition of the atomic masses of the atoms present in that compound. It is represented in atomic mass unit.

(b)

Interpretation Introduction

Interpretation:

The most abundant ${\text{PCl}}_{\text{3}}$ should be identified.

Concept Introduction: isotopes of an element have different number of neutrons but same number of protons in every atom.

(c)

Interpretation Introduction

Interpretation:

The ratio of the effusion rates of the heaviestand lightest ${\text{PCl}}_3$ molecules should be calculated.

Concept Introduction:

The process which refers to the movement of gaseous molecules through a small hole with velocity u is known as effusion. Rate of effusion is defined as the rate at which the gaseous molecules effuse out.

Thus, the expression is given as:

Rate of effusion $\propto \sqrt{\frac{1}{M}}$