1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Find the percentage of electrons were removed?

  1. Aug 22, 2011 #1
    1. The problem statement, all variables and given/known data
    A neutral object contains an equal number of positive and negative charges. A particular neutral object contains 7.2e26 electrons. If 9.5e6 electrons are removed, what percentage of the electrons where removed?


    2. Relevant equations
    coulomb = 6.24e18 electrons

    elentary charge = 1.6 E -19 coulombs


    3. The attempt at a solution
    I'm having difficulties of solving the percentage of the electrons were removed,

    I did this:

    9.5e6 / 7.2e26 = 1.32e-20

    But the answer says it's 1.32e-18, so I don't know how it got that answer.

    Any help will be appreciated.

    Thanks
     
  2. jcsd
  3. Aug 22, 2011 #2

    Mark44

    Staff: Mentor

    To convert a number to a percentage, multiply by 100.
     
  4. Aug 22, 2011 #3
    Wow, I forgot about that. What am I thinking? haha thanks.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Find the percentage of electrons were removed?
Loading...