Step-by-step explanation:
The method to express the amount of substance is called mole concept. The amount of substance that contains 6.023 × 10²³ particles is equivalent to 1 mole. It is equal to the size of a molecule in solid-state. No of moles can be calculated as mass divided by molar mass or the molecular mass. Hence, A mole of an element in solid state is about the size of a molecule.