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If a piece of jewelry were electroplated with gold for 25 seconds at 1.5 A, how many grams of gold would be plated?

(Note: 1 A = 6.241 1018 e–/s. The reaction for the reduction of gold ions to gold metal is Au+ + 1e– Au(s).)

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The mass of gold is 0.077 g of Au.

How many grams of gold would be plated?

Now we know that gold can be plated according to the electrochemical equation;  Au+ + 1e– Au(s).

In an electrochemical  reaction, one specie is oxidized while the other specie is reduced. In this case;

197 g of gold is plated by 96500 C of electricity

x g of gold is plated by (25s * 1.5A) of electricity

x =  197 g * (25s * 1.5A) /96500 C

x = 0.077 g of Au

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