5) 0.32 A

Total number of ions per second = 10¹⁸ ions

Total charge = 2 x 1.6 x 10⁻¹⁹ C

Current = (2 x 1.6 x 10⁻¹⁹) x (10¹⁸)

(2 x 1.6 x 10⁻¹⁹) x (10¹⁸)

(3.2 x 10⁻¹⁹) x (10¹⁸)

(3.2 x 10⁻¹⁹⁺¹⁸)

(3.2 x 10⁻¹)

0.32 A