# What is the mass of 6*mol*H_2S molecules?

May 18, 2017

Equivalently, I might ask how many eggs I need to make $\text{6 dozen}$ eggs. You need $6 \cdot m o l$ of hydrogen MOLECULES.....

#### Explanation:

The $\text{mole}$ is an entirely equivalent quantity to a $\text{dozen}$.

A mole of something, atoms, molecules, electrons, eggs, SPECIFIES a quantity of $6.022 \times {10}^{23}$ INDIVIDUAL ITEMS of that something. Chemists often use the symbol the symbol ${N}_{A}$ to represent the so-called $\text{Avogrado's number}$.............

So, let's assess the number of particles in 6 dozen ${H}_{2} S$ molecules. Clearly, there are 144 hydrogen atoms, and 72 sulfur atoms. Agreed?

So if there are is a $6 \cdot m o l$ quantity there are $12 \times {N}_{A}$ hydrogen atoms, and $6 \times {N}_{A}$ sulfur atoms.

And given that ${N}_{A}$ ""^1H atoms has a mass of $1 \cdot g$, and a mass of ${N}_{A}$ ""^32S is $32 \cdot g$, we can use the mole as the link between the micro world of atoms and molecules, with the macro world of grams, and litres....those quantities we can measure in a laboratory.