The electrochemical equivalent of a metal is $3.3 \times 10 ^ { - 7 } \mathrm {~kg}$ per coulomb. The mass of the metal liberated at the cathode when a 3 A current is passed for 2 seconds will be\\
(1) $19.8 \times 10 ^ { - 7 } \mathrm {~kg}$\\
(2) $9.9 \times 10 ^ { - 7 } \mathrm {~kg}$\\
(3) $6.6 \times 10 ^ { - 7 } \mathrm {~kg}$\\
(4) $1.1 \times 10 ^ { - 7 } \mathrm {~kg}$