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 molecular mass $\begin{array}{l}m_u\end{array}$ and Avogadro constant $\begin{array}{l}N_A\end{array}$ as:

$\begin{array}{l}\displaystyle M = m_u \cdot N_A\end{array}$

Derivation

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

where

$\begin{array}{l}N\end{array}$

number of molecules in a substance of amount $\begin{array}{l}\nu\end{array}$

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See also