Question

what is the mass of 2 moles electrons
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Answer 1

1 electron has a mass of 9.1 X 10¯³¹ kg. 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 or 548.