Chapter 4, Problem 127QP

Interpretation Introduction

Interpretation:

The number of molecules of ${\text{CO}}_{\text{2}}$ present in $\text{960 g}$ of ${\text{CO}}_{\text{2}}$ exhaled daily by an average person is to be determined.

Concept Introduction:

The number of moles of a compound is determined by dividing the mass of the compound to its molar mass. The number of moles is calculated as follows:

$n=\frac{m}{M}$ …… (1)

Here, $n$ is the number of moles, $m$ is the mass, and $M$ is the molar mass.

Then, the number of molecules is determined by multiplying the number of moles to Avogadro's number and is given as follows:

$\text{Molecules}=n\times {\text{N}}_{\text{A}}$ …… (2)

Here, ${\text{N}}_{\text{A}}$ is Avogadro's number that has the value equal to $6.022\times {10}^{23}$ .

Substitute equation (1) in equation (2) as follows:

$\text{Molecules}=\frac{m}{M}\times {\text{N}}_{\text{A}}$ …… (3)