A) B) C) Item 10 Metal plating is done by passing current through a metal soluti

Question

A)

B)

C)

Item 10 Metal plating is done by passing current through a metal solution. For example, an item can become gold plated by attaching the item to a power source and submerging it into a Au solution. The item itself serves as the cathode, at which the Au3+ ions are reduced to Au(s). A piece of solid gold is used as the anode and is also connected to the power source, thus completing the circuit. Part A What mass of gold is produced when 11.4 A of current are passed through a gold solution for 15.0 min Express your answer with the appropriate units mass of Au Value Units Submit Hints My Answers Give Up Review Part

Explanation / Answer

A)
charge passed,
Q = I*t
= 11.4 A * (15*60) s
= 10260 C

1 mol of electron = 96485 C

moles of electron passed = 10260/96485 =0.106 mol

3 mol of electrons are required per mol of Au

moles of Au produced = 0.106/3 = 0.0353 mol

molar mass of Au = 196.97 g/mol

mass of Au = number of moles * molar mass
= 0.0353 * 196.97
= 6.96 g

Answer: 6.96 g

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