Mole/Examples/Water
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Example of Mole
$1$ mole of water has a mass of (approximately) $18$ grams.
Proof
By definition, a molecule of water is composed of:
It follows that $1$ mole of water is composed of:
The (by far) most plentiful isotopes of these elements are:
- hydrogen-$1$, with an atomic mass of approximately $1$
- oxygen-$16$, with an atomic mass of approximately $16$.
From Mass of Mole of Isotope of Element:
- the mass of $1$ mole of hydrogen-$1$ is $1 \ \mathrm g$
- the mass of $1$ mole of oxygen-$16$ is $16 \ \mathrm g$.
Hence the mass of $1$ mole of water is $2 \times 1 + 16 = 18$.
$\blacksquare$
Sources
- 1978: A.P. French and Edwin F. Taylor: An Introduction to Quantum Physics ... (previous) ... (next): $1$: Simple models of the atom: $\text {1-3}$: The Electrical Structure of Matter