Chapter 13, Problem 18PE

Interpretation Introduction

Interpretation:

Number of moles in $25\text{ g}$ of ${\text{Na}}_{\text{2}}{\text{B}}_4{\text{O}}_{\text{7}}\cdot {\text{10H}}_{\text{2}}\text{O}$ has to be calculated.

Concept Introduction:

Mole is the unit that measures the quantity such as atoms, volume, and molecules. It is the ratio of given mass to molecular mass of substance. It is expressed as follows:

  $\text{Number of moles}=\frac{\text{given mass}}{\text{molecular mass}}$