Question

Find the electric charge in couloumb of 9.0 gm of Al³⁺ ions.

(a)   9.6 x 10⁴

(b)   6.9 x 10⁴

(c)   2.9 x 10⁵

(d)   4.80 x 10^-19

Answer 1

Correct option  (a) 9.6 x 10⁴

Explanation:

No of moles of Al³⁺ = 9/27 = 0.33

:. No. of Al³⁺ ions = 0.33 x 6.022 x 10²³

:. Electric charge = 3 x 1.602 x 10^-19 x  2 x 10²³ = 9.6 x 10²³ = 9.6 x 10⁺⁴ Coulomb