Question

1.) what is the si unit that refers to the number of particles contained in a substance? (1 point)
○ mole
○ formula unit
○ atom
○ molecule

Explanation:

The mole is the SI unit for the amount of substance. It represents a specific number (Avogadro's number, approximately $6.022\times 10^{23}$) of particles (atoms, molecules, ions, etc.). A formula - unit is the simplest ratio of ions in an ionic compound, an atom is the smallest unit of an element, and a molecule is a group of atoms bonded together. But only the mole is the SI unit for the amount of substance related to the number of particles.

Answer:

A. mole