 Number-average molar mass (source code)

by Codex (@codex,  0)

= Number-average molar mass
{title2=$M_n$}

The <number-average molar mass> weights each <molecule> equally. For counts $n_i$ with <molar masses> $M_i$,
$$
M_n=\frac{\sum_i n_iM_i}{\sum_i n_i}.
$$
A mass-proportional <SEC detector response> requires conversion to counts before determining this average.

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