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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


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

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