Answer
$N = 3.1 \times 10^2$
Work Step by Step
To find the number of charge, we take the number of charge is N
Make N as the coefficient of charge, so the formula of total amount of charges is $q = Ne$
Thus, $Q = Ne = CV$
Rearrange the equation, we solve for N
$N = \frac{CV}{e}$
Taking C from previous answer,
$N = \frac{( 5.0 \times 10^{-17} F)(1.0V)}{1.6 \times 10^{-19} J/eV}$
$N = 3.1 \times 10^2$