Ive asked these multiple times and always get incorrect responses. Please answer

Question

Ive asked these multiple times and always get incorrect responses. Please answer correct! Im on my last attempt.

Part A: You need to electroplate a 140-nm-thick zinc coating onto both sides of a very thin, 1.0 cm × 1.0 cm copper sheet. You know that the charge carriers in the ionic solution are divalent (charge 2e) zinc ions. The density of zinc is 7140 kg/m3. How many seconds will it take the zinc to reach the desired thickness?

Part B: A 1.5-mm-diameter, 40-cm-long copper wire carries a 2.0 A current. What is the potential difference between the ends of the wire?

Part C: A 4.5 V potential difference is applied between the ends of a 0.70-mm-diameter, 50-cm-long nichrome wire. What is the current in the wire?

Explanation / Answer

A)

(7140 kg/m³)(2.00 cm²)((1e-2)² m² / cm²)(140 nm)(1e-9 m / nm)(1000 g / kg) = 1.9992e-4 g

(1.9992e-4 g)(mol Zn / 65.382 g)(2 mol e- / mol Zn)(96485 C / mol e-) = 0.5900 C

(0.5900 C)(s / 1.40 mC)(mC / 1e-3 C) = 422 s

The time taken to reach the desired thickness = 422/2 = 211 s (ans)

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