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Homework Help: Heat Capacity, unknown metal

  1. Apr 14, 2010 #1
    1. The problem statement, all variables and given/known data
    Find the quantity of thermal energy absorbed but the water in the calorimeter.
    Mass of metal sample:69.64g
    Water sample: Volume 190mL
    Temp: 24'C
    boiling water: 275mL
    temp of boiling water:90'C
    Sample in Calorimeter
    Initial Heat: 25'C
    30 seconds: 26'C
    60 seconds 26'C
    90 seconds 26'C
    120 seconds 26'C
    2nd Trial
    Mass of metal sample:69.64g
    Water sample: Volume 170mL
    Temp: 26'C
    boiling water: 275mL
    temp of boiling water:98'C
    Sample in Calorimeter
    Initial Heat: 31'C
    30 seconds: 29'C
    60 seconds 29'C
    90 seconds 28'C
    120 seconds 28'C
    2. Relevant equations
    (m_H2O)(c_H2O)(deltaT_H2O)=-(m_metal)(c_metal)(deltaT_metal)


    3. The attempt at a solution
    (190)(4.18)(-66)=(69.64)(c_metal)(-3)
    ______________ =250.89 c_metal
    (69.64)(-3)

    (170)(4.18)(-69)=(69.64)(c_metal)(1)
    ______________= 704.06
    (69.64)(1)

    I know the sample is tin because the metal was labeled "Sn" even though the point of the lab was to "identify" an unknown metal.
     
    Last edited: Apr 14, 2010
  2. jcsd
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