Mass of half mole of electron is about: (given: mass of electron = 9.1 x 10^-28 g) Options: A) 0.546 mg B) 0.273 mg C) 1.092 mg D) 4.55 mg
Answers
Answered by
139
one electron weighs 9.1 x 10⁻²⁸g
1mole has 6.022x 10²³ electrons/ particles.
Mass of 1 mole of electron
=9.1 x 10⁻²⁸x 6.022x 10²³
=54.8x10⁻⁵ g
Half mole of electron =54.8x10⁻⁵/2
=27.4 x10⁻⁵ g
=0.274mg
Hence Option(B) is correct answer
1mole has 6.022x 10²³ electrons/ particles.
Mass of 1 mole of electron
=9.1 x 10⁻²⁸x 6.022x 10²³
=54.8x10⁻⁵ g
Half mole of electron =54.8x10⁻⁵/2
=27.4 x10⁻⁵ g
=0.274mg
Hence Option(B) is correct answer
Similar questions