Heat Problems
• Calorimeter – an
instrument used to
study the heat of
chemical reactions.
• Calorimetry – the
study of the heat of
chemical reactions.
Problem 1
• A 1.00 g sample of octane is
burned in a calorimeter containing
1200 g water at 25oC. After the
reaction, the final temperature of
the water is 33.2oC. How much
heat did the octane release?
Problem 2
• Calculate the specific heat of
platinum of 1092 Joules of heat
were released when 125 grams of
platinum cooled 65.2 Celsius
degrees.
Problem 3
• What would be the final
temperature if 8.94 x 103 J of heat
were added to 454 grams of
copper at 23oC?
Problem 4
• A 50g piece of aluminum at a
temperature of 100oC is placed in
50g of water at 20oC. What is the
final temperature of the system?
1. (4.18 J/gC)(1200g)(33.2-25)
41131 J
2. 1092J = (C)(125g)(62.5)
0.134 J/gC
3. 8.94 x 103 = (.385J/gC)(454g)(Tf-23)
74oC
4. -[(0.9J/gC)(50g)(Tf-100)] =
(4.18J/gC)(50g)(Tf-20)
34oC