What letter indicate the amount of a substance? How is the amount of a substance related to the number of structural

What letter indicate the amount of a substance? How is the amount of a substance related to the number of structural units in this substance? Write the appropriate formula.

The amount of a substance is indicated by the Greek letter v (nu) or, simplified, the Latin n (en).
n = N / Na
where N is the number of structural units of the substance
Na – Avogadro’s constant equal to 6.2 * 10 ^ 23 mol1

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