A physical property defined as the mass of a given substance (chemical element or chemical compound) by the amount of substance

Ratio of substance mass $\begin{array}{l}m\end{array}$ to amount of substance $\begin{array}{l}\nu\end{array}$ :

$\begin{array}{l}\displaystyle M = \frac{m}{\nu}\end{array}$

It relates to molecule mass as:

$\begin{array}{l}\displaystyle M = \frac{m}{\nu} = m \frac{N_A}{N} = m_1 \cdot N_A\end{array}$

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See also