One Faraday of electricity liberates x × 10 ^ – 1 gram atom of...

One Faraday of electricity means it is equivalent to one mole of electrons charge.

${Cu}^{2 +} + 2{e}^{–} \to Cu$

$2$ Faraday $\to 1molCu$

$1$ Faraday $\to 0 . 5molCu$ deposit

$0 . 5mol = 0 . 5gatom = 5 \times {10}^{– 1}$

$x = 5$