Answer
1.3 nC
Work Step by Step
The total charge $Q$ is $Ne$, where $N$ is the number of ions and $e = 1.6 \times 10^{-19} C$.
The number of ions $N = (5.6 \times 10^{11})(1.5\times 10^{-2}) = 8.4 \times 10^9$ ions. The total charge $Q = Ne = (8.4 \times 10^9)(1.6 \times 10^{-19}) = 1.3 \times 10^-9 \ C = 1.3 \ nC.$
