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Homework Help: Finding mass of fat on a chicken by volume and density

  1. Jan 23, 2008 #1
    1. The problem statement, all variables and given/known data
    This was a lab we did in class 2 day we took the measured the weight of a chicken in the air and in water. Than found the masses and mass of h20 displaced and the volume displaced

    Mass chicken in air = 1.489 kg
    Mass chicken in h20 = .112 kg

    Mass h20 displaced = 1.377 kg
    Volume h20 displaced = 1.377E –3 m3




    2. Relevant equations
    1. Mass fat + Mass rest of chicken (else) = 1.489 kg
    2. Volume fat + V else = 1.377E –3 m3
    3. density Fat = 900 kg/m3 = Mass fat/ V fat
    4. density else = 100 kg/m3 = Mass else/V else



    3. The attempt at a solution

    So I assume this is a substitution prob. I need to sub. V fat= Mass fat/ 900kg/m3
    into one of the equations.

    So what I did so far was

    Mass fat /900kg/m3 + Mass else/1100kg/m3 = 1.377E –3 m3

    Mass fat/ 900kg/m3= 1.377E –3 m3 – Mass else/1100kg/m3

    Mass fat= 900kg/m3(1.377E –3 m3 – Mass else/1100kg/m3)

    Mass fat= 1.2393kg – 99E4 Mass else is this wrong so far?

    Any help would be great we just did the lab today and its due Friday and I need the calcs done to do the report, thanks
    -Tim
     
  2. jcsd
  3. Jan 24, 2008 #2
    i figured it out this moarning
     
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