What is the charge on 0.05 mol of electrons?
What is the charge on 0.05 mol of electrons?

1. 2412.5 C
2. 965 C
3. 4825 C
4. 9650 C

Solution: 4825 C

We have:

Mass of one electron = 9.10×10−31 kg

Charge of one electron = 1.602×10−19 coulomb

number\,of\,moles=\frac{number\,of\,particles}{Avogadro\,Number}

\therefore number\,of\,particles=6.022\times {{10}^{23}}\times 0.05

number\,of\,particles=0.3011\times {{10}^{23}}

Therefore,charge\text{ }of\text{ }0.3011\times {{10}^{23}}\text{ }electrons:

Ch\arg e=0.3011\times {{10}^{23}}\times 1.6\times {{10}^{-19}}

charge=4825\,C