A cylindrical steel rod 4.0 cm long and 1.0 cm in diameter is electroplated on its…
CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry
Problem
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