Answer
$N=8.4\times 10^{18}electrons$
Work Step by Step
We can find the number of electrons as
$N=\frac{Q}{e}$
$\implies N=\frac{1}{e}(\frac{\Delta Q}{\Delta t}t)$
We plug in the known values to obtain:
$N=\frac{1}{1.6\times 10^{-19}}[\frac{0.30}{1.0}(4.5)]$
$N=8.4\times 10^{18}electrons$
