Chapter 3.1, Problem 3.4AFP

Interpretation Introduction

Interpretation:

The mass of sodium fluoride in one liter of water which contains $1.19\times {10}^{19}$ formula units of sodium fluoride is to be determined. Also, a road map for the calculations of the mass of sodium fluoride is to be drawn.

Concept introduction:

One mole is defined as the amount of substance that contains the same number of entities such as molecules, ions, atoms as the number of atoms in $12\text{ g}$ of $\text{C-12}$. This number is called Avogadro’s number. The value of Avogadro’s number is $\text{6}\text{.022}\times {\text{10}}^{23}\left(\text{entitites/mol}\right)$.

Molar mass is defined as the mass of $1\text{ mol}$ of a chemical substance in grams. The molar mass of a compound is calculated by the addition of the molar mass of each element multiplied by its number of atoms present in the chemical formula.

A formula unit is used for the ionic compound to represent their empirical formula. Following is the formula to calculate the mass of an ionic compound from the given formula units,

$\text{Mass }\left(\text{g }\right)=\left(\text{Given formula units}\right)\left(\frac{1\text{ mol}}{6.022\times {10}^{23}\text{ formula units}}\right)\left(\frac{\text{No}\text{. of grams}}{\text{1 mol}}\right)$