Number-average molar mass ( $M_{n}$ )

The number-average molar mass weights each molecule equally. For counts

n_{i}

with molar masses

M_{i}

,

M_{n} = \frac{\sum _{i} n _{i} M _{i}}{\sum _{i} n _{i}} .

A mass-proportional SEC detector response requires conversion to counts before determining this average.

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