# Electric Current Problem

1. Feb 15, 2010

### bob12345

1. The problem statement, all variables and given/known data

If 3.32 kg of gold is deposited on the negative electrode of an electrolytic cell in a period of 10.98 h, what is the current in the cell in this period?Assume that each gold ion car ries one elementary unit of positive charge.

2. Relevant equations

i dont know what eqation to use all i know is current= charge/time

3. The attempt at a solution
i couldnt find the solution because i didnt know how to use the mass??

2. Feb 15, 2010

### ehild

Are you sure that it was 3.32 kg ??? A big piece of gold.

Anyway: Find the molar mass of gold (about 197 g/mol) . Get the moles of gold from the given mass. Multiply by Avogadro number: you get the number of gold atoms. Each carries an elementary charge -how much is it? You know the charge and time, easy to get the current.

ehild

Last edited: Feb 15, 2010
3. Feb 15, 2010

### bob12345

yes it was 3.32 and now ill try working it out how you said

4. Feb 15, 2010

### bob12345

the atomic mass is 196.97 bt how do you get it to moles?

5. Feb 15, 2010

### ehild

This value means that the mass of one mole gold is 196.97 g.
If 196.97 g is one mole, how many moles are in 3.32 kg?

ehild