Which of the following is the SI unit for measuring the amount of a substance?

mole (mol)

The correct answer is option 3. mole (mol).

The SI unit for measuring the amount of a substance is Mole (mol). The mole (mol) is the SI base unit used to measure the amount of a substance. It represents the number of elementary entities (such as atoms, molecules, ions, or particles) in a sample. One mole contains approximately \(6.022 \times 10^{23}\) elementary entities, which is known as Avogadro's number.