HW help Constants Part A For a science experiment you need to electroplate zinc
ID: 1874201 • Letter: H
Question
HW help
Constants Part A For a science experiment you need to electroplate zinc onto both sides of a very thin, 3.00 cm × 3.00 cm copper sheet. You want the zinc thickness to be 100 nm, and you know that the charge carriers in the ionic solution are divalent (charge 2e) zinc ons. The density of zinc is 7140 kg/m3 f the electroplating apparatus operates at 1.40 mA, how long wil it take the zinc to reach the desired thickness? Note: The Hints for this problem walk you through the many steps that must be done to find the final answer. Express your answer in seconds to three significant figures View Available Hint(s) Submit uest Answer Provide Feedback Next >Explanation / Answer
Zn goes to Zn++ state, this implies 2e- we need for each mole of Zn.
We know that;
Q=n(e)*F;
t=n(e)*F/I, where F=96500/mole Faraday's constant
t= 2*96500/(1.40*10-3)sec=137857142.9 sec=38293.65 hour.=1595.56 days=4.37 years
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