Answer
The current is $~~22.7~mA$
Work Step by Step
We can find the number of ions per hour:
$\frac{100\times 10^{-6}~kg}{3.92\times 10^{-25}~kg} = 2.55\times 10^{20}$
We can find the current:
$i = \frac{(2.55\times 10^{20})(3.20\times 10^{-19}~C)}{3600~s}$
$i = 22.7~mA$
The current is $~~22.7~mA$.
