Question: how to calculate mass of 1 mole of electron?
Answer: 1 electron has a mass of 9.1 X 10¯³¹ kg. 1 mole has 6.023 x 10²³ particles. So 1 mole of electrons has a mass of 9.1 X 10¯³¹ x 6.023 x 10²³ ≈ 5.481 X 10^(-7) kg. One mole of electron means Avogadro number of electrons or 6.023×10^(23) electrons.