The SI unit of amount of substance

Explanation

The SI unit for the amount of substance is the mole, abbreviated as mol. A mole represents a quantity containing exactly 6.022 140 76 × 10²³ elementary entities, such as atoms or molecules.

Given the options:

a) Mol

b) mole

c) M

d) Mole

The correct answer is a) Mol, as "mol" is the standardized symbol for the mole in the International System of Units (SI).