Question

How many moles of electrons weigh one kilogram?

A. 6.022 x 1023

B. 1 / 9.108 x 1031

C. 6.022 / 9.108 x 1054

D. 1 / 9.108 × 6.022 x 108

 

 

Answer 1

Given-

Mass of one electron = 9.108 × 10-³¹kg.

Therefore we have,

Mass of one mole of electrons =9.108 × 10-31 × 6.023 × 1023 = 9.108 × 6.023 × 10-⁸ kg.

 

The number of moles of electrons that weigh one kilogram

Now solving we will get,

= 1 / 9.108 × 6.023 × 10-⁸ = 1 / 9.108 × 6.023 × 10⁸

 

 

Moles of electron = 1/9.108 × 6.022 × 10⁸.

Option D is correct