Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Electric Current Problem

  1. Feb 15, 2010 #1
    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. jcsd
  3. Feb 15, 2010 #2

    ehild

    User Avatar
    Homework Helper

    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
  4. Feb 15, 2010 #3
    yes it was 3.32 and now ill try working it out how you said
     
  5. Feb 15, 2010 #4
    the atomic mass is 196.97 bt how do you get it to moles?
     
  6. Feb 15, 2010 #5

    ehild

    User Avatar
    Homework Helper

    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
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook