Question

The charge in coulombs on lg ion of N^-3 is:

(a) 28.9 × 10⁵ C
(b) 2.89 × 10⁵ C
(c) 2890 C
(d) 28900 C

Answer 1

(b) 2.89 × 10⁵ C

Charge on 1 gm ion of N^-3

= 3 × 1.6 × 10^-19 C

One g ion = 6.023 × 10²³ ion

Charge on 1 gm ion of N^-3

= 3 × 1.6 × 10^-19 × 6.023 × 10²³

= 2.89 × 10⁵ C