Calculating Heat

1
Calculating Heat
2
Q m x C x T

• Q is heat in Joules
• M is mass in grams
• C is specific heat capacity
• T is the change in temperature
• (final temperature initial
  temperature)

3
Answer the following questions

• How many joules of heat are needed to raise the
  temperature of 10 grams of aluminum from 22oC to
  55oC if the specific heat of aluminum is 0.90
  J/goC?
• What are you solving for?
• What will be the unit of measure?
• What is the mass of aluminum?
• What is the specific heat of aluminum?
• What is the final temperature?
• What is the initial temperature?

4
Substitute the information into the formula and
calculate

• Q m x C x T (final temp initial temp)

5
Answer the following questions

• 100.0 mL of 4.0C water is heated until its
  temperature is 37C. If the specific heat of
  water is 4.18 J/gC, calculate the amount of heat
  energy needed to cause this rise in temperature.
• What are you solving for?
• What will be the unit of measure?
• What is the mass of the water?
• What is the specific heat of water?
• What is the final temperature?
• What is the initial temperature?

6
Substitute the information into the formula and
calculate

• Q m x C x T (final temp initial temp)

7
Answer the following questions

• 25.0 g of mercury is heated from 25C to 155C,
  and absorbs 455 joules of heat in the process.
  Calculate the specific heat capacity of mercury.
• What are you solving for?
• What will be the unit of measure?
• What is the amount of heat absorbed?
• What is the mass of the mercury?
• What is the final temperature?
• What is the initial temperature?

8
Substitute the information into the formula and
calculate

• Q m x C x T (final temp initial temp)