A cylindrical steel rod 4.0 cm long and 1.0 cm in diameter is electroplated on its curved surface only (both ends are masked) with zinc using a constant current of 2.00 A for 8.00 min. The electrolyte supplies Zn²⁺ ions.
Data: atomic mass of Zn = 65.4 g mol⁻¹; density of Zn = 7.14 g cm⁻³; Faraday constant = 9.65 × 10⁴ C mol⁻¹.
What is the average thickness of the zinc layer, expressed in micrometres (µm)?
a) 18µm
b) 36µm
c) 73µm
d) 3.6µm