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Specific Heat Capacity

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Specific Heat Capacity Specific heat = heat required to raise 1 g of substance 1 C Substance Specific Heat (J/g C) Every substance has it s own specific heat ... – PowerPoint PPT presentation

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Title: Specific Heat Capacity


1
Specific Heat Capacity
Specific heat heat required to raise 1 g of
substance 1C
Substance Specific Heat (J/gC)
Water 4.18
Aluminum 0.897
Gold 0.129
Ethanol 2.44
  • Every substance has its own specific heat
    because it has a different arrangement of atoms

2
Specific Heat Calculations
  • q c m ?T
  • q heat J
  • c specific heat capacity J / gC
  • m mass g
  • ?T change in temperature C
  • ?T Temp Final Temp Initial

3
Specific Heat Problems
  • 1. If the temperature of 34.4 g of ethanol
    increases from 25C to 78.8C, how much heat has
    been absorbed by the ethanol? (Specific heat for
    ethanol 2.44 J/(gC) )

4
Specific Heat Problems
  • 2. If the temperature of a 100 g piece of
    aluminum increases from 20C to 150C, how much
    heat has been absorbed by the aluminum. The
    specific heat of aluminum is 0.897 J/(gC).

5
Specific Heat Problems
  • 3. A 4.5 g nugget of pure gold absorbed 276 J of
    heat. What was the final temperature of the gold
    if the initial temperature was 25C. The specific
    heat of gold is 0.129 J/(gC).

6
Specific Heat Problems
  • 4. A 155 g sample of an unknown substance was
    heated from 25C to 40C. In the process, the
    substance absorbed 5696 J of energy. What is the
    specific heat of the substance?

7
Specific Heat Problems
  • 5. A 352 g sample of an unknown substance was
    heated from 40C to 100C. In the process, the
    substance absorbed 7696 J of energy. What is the
    specific heat of the substance?

8
Specific Heat Problems
  • 6. If the temperature of 300 g of ethanol
    increases from 20C to 100C, how much heat has
    been absorbed by the ethanol? (Specific heat for
    ethanol 2.44 J/gC)

9
Specific Heat Problems
  • 7. What is the mass of a substance that has a
    specific heat of 0.449 J/gC and raises its
    temperature in a calorimeter from 20C to 90C
    when it release 12,300 J of energy?

10
Specific Heat Problems
  • 8. What is the mass of a substance that has a
    specific heat of 0.362 J/gC and raises its
    temperature from 25C to 110C when it absorbs
    8700 J of energy?
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