Heat Capacity Lab

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  • Topic: Heat, Specific heat capacity, Thermodynamics
  • Pages : 4 (831 words )
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  • Published : May 8, 2008
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Specific Heat Capacity Lab

Sample MaterialMass of Sample (kg)Initial Temperature of hot Water. (oC)Initial Temperature of cool water (oC)Final Temperature of sample/ water (oC)t of Water (oC) Specific heat Capacity of Sample (J/kg oC)Mass of Cold Water Brass68.2± 0.5

±0.0005
=0.0682 kg97.5 ± 0.224.0 ± 0.2 28.2 ± 0.24.2 ± 0.43.99 x 10 -2107g ± 1 0.107 kg ± 0.001 kg

-Qsolid = Qwater

-c • m • t = c • m • t

-c = c • m • (Tf –Ti)
m • (Tf – Ti)

-c = 4200 J • 0.107 kg (28.2 oC – 24.0 oC)
____kg/ oC_____________________
0.0682 kg • (28.2 oC – 97.4 oC)

-c = -1887.48
4.72626

c = 399. 3601706 J/kg oC

Calculations

-Qsolid = Qwater

-c • m • t = c • m • t

-c = c • m • (Tf –Ti)
m • (Tf – Ti)

-0.107 ± 0.001 • 4200 (28.2± 0.2 – 24. 0 ± 0.2)
0.0682 ± 0.0005 (28.2 ± 0.2- 97.5 ± 0.2)

-449.4 ± 4.2 (4.2 ± 0.4)
0.0682 ± 0.0005 ( - 69,3 ± 0.4)

-449.4± 4.2 (4.2 ± 0.4 )
449.2 4.2
0.0682 ± 0.0005 (-69.3 ± 0.4)
0.0682 -69.3

-449.4 ± 0.934% (4.2 ± 9.52%)
0.0682 ± 0.733% (69.3 ± 0.5778%)

1887.48 ± 10.454
4.72626 ± 1.31

399.36 ± 11.764

399.36 • 0.11764= 46.94
399.36 ± 46.9 J/kg oC

Discussion Questions

1. After consulting table 8.4 on page 260 of the textbook table, possible metals used in this experiment include:

-Brass = 3.8 x 10 -2
-Copper = 3.9 x 10 -2
-Iron = 4.6 x 10 -2

2)Once figuring out that the unknown metal would either brass, copper or iron, research was done to figure out their own properties. Although the specific heat capacity points to Copper, that was not the case for physical properties of the metals. Our metal was a golden colour, and iron is not a golden colour, but rather a bright white or silvery colour. As well our piece of metal to have no evidence of corrosion within it, and iron is prone to corrosion to exposition to water and air....
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