A current of 2 A flows in a wire, knowing that the elementary charge is 1.6 × 10⁻¹⁹. How many electrons pass through a cross-section of the wire during a time interval of 1 s?

Suppose that in an experiment of electrochemistry, you remove 1 electron from each set of 10 atoms in a block of copper of mass m = 0.3 kg. The molar mass of copper is 64 g/mol. Determine the total charge removed from the block.
Data: Avogadro's number N_A = 6.02×10²³, the elementary charge of an electron −1.6.10⁻¹⁹ C.