Question

How many electrons are there in 3.5 x 10" C?

Answer 1

Answer:

$2.19\cdot 10^{20}$ electrons

Explanation:

I assume you mean:

How many electrons are there in $3.5\cdot 10^{1}C$?

Solution:

The charge of one electron is (in magnitude)

$e=1.6\cdot 10^{-19}C$

The charge in this problem is

$Q=3.5\cdot 10^{1} C$

So, we can find how many electrons are in this charge by simply dividing the total charge by the charge of one electron:

$n=\frac{Q}{e}=\frac{3.5\cdot 10^{1}}{1.6\cdot 10^{-19}}=2.19\cdot 10^{20}$