# Electrochem

posted by .

A baby's spoon with an area of 6.25 cm^2 is plated with silver from AgNO3 using a current of 2.00 A for two hours and 25 minutes.
a) If the current efficiency is 82.0%, how many grams of silver are plated?
b) What is the thickness of the silver plate formed (d= 10.5 g/cm^3)?

I think the efficiency part is tripping me up; I can't even think of how to start the problem. I'm guessing the efficiency has something to do with the amount done over the amount of time taken? But still; I don't know how I can relate the area of the spoon to grams of silver. Any help is appreciated.

Just calculate the current OR coulombs and multiply by 0.82 and proceed. That 82% simply means that 100 A appears to be only 82 A or 500 coulombs (just a made up number) appears to be only 0.82*500).

## Similar Questions

1. ### Chemistry

AgNO3 solutions are often used to plate silver onto other metals. What is the maximum amount of silver in grams that can be plated out of 3.8 L of an AgNO3 solution containing 3.2% Ag by mass?
2. ### chemistry

Silver tarnishes (turns to Ag2S) in the presence of oxygen and hydrogen sulfide according to the following equation: 4Ag(s) + 2H2S(g) + O2(g) ¨ 2Ag2S(s) + 2H2O(l) Usually, H2S is the limiting reactant. If a silver spoon is placed …
3. ### Chemistry Help

How many grams of silver will be obtained when an aqueous silver nitrate solution is electrolyzed for 22.0min with a constant current of 2.28A ?
4. ### Chem

AgNO3 solutions are often used to plate silver onto other metals. What is the maximum amount of silver in grams that can be plated out of 4.2L of an AgNO3 solution containing 3.1% Ag by mass?
5. ### Chemistry

A spoon of sterling silver is 92.5% silver by mass and the rest is made of other metals, usually copper. If the spoon contains 0.557 mol of silver, what is the mass of the spoon?
6. ### Chemistry

a) A current of 1.50 Amperes passes through a solution of AgNO3 for 3.0 hours. What mass, in grams, of silver collects on the cathode?
7. ### physics

A 25.0 g silver spoon at 20.0 C is placed in a cup of coffee initially at 90 C. How much heat does the spoon absorb from the coffee as the spoon warms up to 89 C?
8. ### Science

Calculate the mass of silver deposited when a current of 2.6 A ls passed through a solution of silver salt for 70 minutes. (Ag=108; 1 faraday=96 500 c)
9. ### chemistry

Calculate the amount of silver deposited at cathod when 5 ampere of current is passed for 50 minutes through a solution of AgNO3
10. ### science

Which of the following materials is a good conductor of electric current?

More Similar Questions