Question

if the mass of an electron is 9×10^-28 grams,weight of one mole of electrons is??

Answer 1

Mass of one electron = 9*10^-31 kg

Now, Quantity of one mole =
6.022*10^23 entities

So,
mass of one mole of electrons
= 6.022*9 *10^23*10^-31
= 54.198*10^-8
= 5.4198 * 10^-7 kilograms
= 5.4198 * 10-4 grams.

Hope this helps you !!

Answer 2

Sol: Mass of electron = 9 x 10⁻²⁸ g

No. of electrons in 1 mole = 6.022x10²³

Total mass of Electron in 1 mole = (9x10⁻²⁸) x (6.022x10²³) g

Total mass of electron in 1 mole = 54.027 x 10⁻⁵ g

Total mass of electron in 1 mole = 0.54027 x10⁻³ g

∴Total mass of electron in 1 mole ≈ 540 mg .