MP:
BP:
0.00°C 100. °C
cp (solid):
2.03 J/g°C
cp (liquid):
4.184 J/g°C
cp (gas):
2.01 J/g°C
Hfusion:
6.01kJ/mol
Hvaporization:
40.7 kJ/mol
• The data above is for water. Determine the
amount of heat (in kJ) needed to raise the
temperature of 75.0g of water from 12.0°C to
115.0°C.
Green – draw heating curve
Blue – formula and substitution – first calculation
black – formula and substitution – next two calculations
Red - answer
199kJ
MP:
-39°C
BP:
356 °C
cp (solid):
0.12 J/g°C
cp (liquid):
0.14 J/g°C
cp (gas):
Hfusion:
0.100 J/g°C 2.3 kJ/mol
Hvaporization:
59.2 kJ/mol
• The data above is for mercury. Use the data to
determine the amount energy released when
the temperature of 15.0g of mercury cools
from 70.0°C to -45°C.
Green – draw heating curve
Blue – formula and substitution – first calculation
black – formula and substitution – next two calculations
Red - answer
-412 J
MP:
-39°C
BP:
356 °C
cp (solid):
0.12 J/g°C
cp (liquid):
0.14 J/g°C
cp (gas):
Hfusion:
0.100 J/g°C 2.3 kJ/mol
Hvaporization:
59.2 kJ/mol
• 0.50g of mercury spill in the classroom, where
the temperature is 22°C. How much heat
would be required to completely vaporize the
mercury that spilled?
Green – draw heating curve
Blue – formula and substitution – first calculation
black – formula and substitution – next two calculations
Red - answer
171 J
MP:
-39°C
BP:
356 °C
cp (solid):
0.12 J/g°C
cp (liquid):
0.14 J/g°C
cp (gas):
Hfusion:
0.100 J/g°C 2.3 kJ/mol
Hvaporization:
59.2 kJ/mol
• A 100.0g sample of mercury is at -69°C.
Determine the final temperature and the state
of the mercury if it absorbs 2.5kJ of heat.
32°C
Calorimeter Problems
A 15.0g sample of a metal is heated to 99.7°C
and then placed in a calorimeter containing
35.0g of water at 24.6°C. The temperature is
monitored until a final temperature of 28.2°C is
reached.
Determine the specific heat of the metal.
0.49 J/g°C
Calorimeter Problems
A 15.0g sample of a aluminum (specific heat =
0.900 J/g°C) is heated and then placed in a
calorimeter containing 40.0g of water at 21.0°C.
The temperature is monitored until a final
temperature of 24.9°C is reached.
Determine the initial temperature of the
aluminum.
73°C