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University
Course Code
Instructor’s Name
Date of Submission
Specific Heat and Latent Heat
Objectives:
The purpose of this lab was to determine the specific heat of a metal as well as the heat of fusion of ice.
Apparatus: The equipment used in the experiment include: metal cylinder, beaker, triple beam balance, Styrofoam cup, thermometer and a hot plate.
Theory
The energy required to increase the temperature of 1kg of a substance by 1K is referred to as specific heat, whose SI unit is J/ (kg. K). The specific heat of water, CH2O is 1.000cal / (g. OC) which equivalent to 4186 J / (kg. K). Consider a cup with mass m, holding water of mass mH2O with initial temperature of Ti. When a hot metal block of mass ms at 1000C is …show more content…

The ice was added continuously until the temperature of the water bath dropped to 100C. The final temperature, Tf was then measured after the ice had melted completely. The latent heat of fusion of ice was then computed.

Results
Block number = 13
Mass of Block, ms = 83.3g
Mass of Cup = 5.5g
Measured Temp. of Boiling Water = 99.6 C
CH2O = 1.000cal / (g. OC) = 4186 J / (kg. K).
Table 1: Results for specific heat
Specific Heat of Sample cgs units SI units
Trial # Mass of H2O Initial Temp. Final Temp. cs (cal / (g 0c)) cs (J / (kg 0C))
1 91.8 21.0 C 32.9 C 0.1954 817.94
2 91.8 21.2 C 33.2 C 0.1979 828.41

Average cs = 0.1967 cal / (g 0c)
Average cs = 823.17 J / (kg 0C)
Calculations:
Specific heat of a metal, cs = mH2O cH2O (Tf – Ti) / ms (100oc – Tf)

For Trial 1: cs = 91.8g × 1.000 cal. / (g. OC) (32.9 – 21.0) OC / 83.3 (100oc – 32.9) OC
= 1092.42 / 5589.43 = 0.1954 cal / (g 0c)
Converting to SI units:
0.1954 cal / (g 0c) × (4186 J / (kg. K). / 1.000cal / (g. OC)) = 817.94 J / kg 0C
For Trial 2: cs = 91.8g × 1.000 cal. / (g. OC) (33.2 – 21.2) OC / 83.3 (100oc – 33.2) OC
= 1101.6 / 5564.44 = 0.1979 cal / (g 0c)
Converting to SI units:
0.1979 cal / (g 0c) × (4186 J / (kg. K). / 1.000cal / (g. OC)) = 828.41J / (kg 0C)
Average cs in cgs units = (0.1954 + 0.1979) = 0.1967 cal / (g 0c)
Average cs in SI units = (817.94+ 828.41) = 823.17 J / kg 0C
Table 2: Results for heat of fusion

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