37. What is the fundamental unit of amount of a substance? A.Mole B.Candela C.Kelvin D.Meter
Option A Solution: The mole, symbol mol, is the SI unit of amount of substance of a specified elementary entity, which may be an atom, molecule, ion, electron, any other particle or a specified group of such particles; its magnitude is set by fixing the numerical value of the Avogadro constant to be exactly 6.022 141 29 × 1023 when it is expressed in the SI unit mol–1.
