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!

Homework Help: Moles in a Cat

  1. Sep 7, 2004 #1
    I have to approximately figure out, to the nearest order of magnitude, how many moles of atoms there are in a 12 kg cat.You are also told that The masses of a hydrogen atom, an oxygen atom, and a carbon atom are 1.0 u, 16 u, and 12 u. .

    all i know is that 1 u=1.66 x 10^-27 kg.
    From here I am unsure where to go.
  2. jcsd
  3. Sep 7, 2004 #2
    There are 6.022 * 10^23 atoms in 1 mole.
    Molar mass of hydrogen is around 1 g/mole....carbon is around 12 g/mole...and oxygen is about 16 g/mole...

    You have 12,000 grams...you can find the moles and then thus find the atoms. :-D
  4. Sep 8, 2004 #3


    User Avatar
    Homework Helper

    But this is a huge cat! :smile:
    I would say that it mainly consists of water....

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