Question

The mass of one mole of electron
a)1.008mg
B)0.55mg
C) 0.184mg
D) 1.673mg

Answer 1

One electron ( e− ) has a mass of 9.10938291 x 10−31kg . One mole of e− is 6.022 x 1023e− .

Answer 2

Answer: B)0.55mg

Explanation:

1 mole of electrons will contain $6.023\times 10^{23}$ electrons.

Now 1 electron weigh=$9.1\times 10^{-31}kg=9.1\times 10^{-25}mg$   $(1kg =10^6mg)$

$6.023\times 10^{23}$ electrons will weigh=$\frac{9.1\times 10^{-25}}{1}\times 6.023\times 10^{23}=0.55mg$