Define mole and Avogadro's number? Will the weight of 1 mole of sodium and 1 mole of oxygen be the same?
Mole: Mole is the measurement in chemistry. It is used to express the amount of a chemical substance.
One mole is defined as the amount of substance of a system which contains as many entities like, atoms, molecules, and ions as there are atoms in 12 grams of carbon - 12'.
Avogadro number: The number of the particles present in one mole of any substance is equal to 6.022x1023. This is called Avogadro's number or Avogadro's constant.
1 mole of sodium (6.023 x 1023 atoms) weighs 23 g (atomic mass). And 1 mole of oxygen (6.023 x 1023 molecules) weighs 32 g (molecular mass). Thus, particles present in 1 mole of oxygen and sodium is same such as (6.023 x 1023 atoms) but the weight could not be same.
