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Homework Help: Chemistry prob- Sigdigs

  1. Sep 12, 2012 #1
    1. The problem statement, all variables and given/known data

    A sheeet of metal is 19.3mm wide and 48.2.mm long. if it weighs 8.171g and the density of the metal is 6.69g/cm63, what is the thickness in mm?

    2. Relevant equations

    V= L*W*H
    H=V/L*W
    D=M/V
    V=M/D

    3. The attempt at a solution

    8.161g(4sig)/6.69g/cm^3(density, so sig digs not counted, right?)

    = 1.22137cm^3(4sig) : convert into mm: 1221.37mm(4sig)

    Area given: 19.3*48.2=930.26

    1221.375(4sig) / 930.26(3sig)

    = 1.31(sig) (thickness)

    Value comes out properly if multiply all 3 volumes. Did I do the sig-digs correctly? Thanks.
     
  2. jcsd
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