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?