Heat Problems Calorimeter – an instrument used to study the heat of chemical reactions. Calorimetry – the study of the heat of chemical reactions.

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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 25 o C. After the reaction, the final temperature of the water is 33.2 o C. 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 10 3 J of heat were added to 454 grams of copper at 23 o C?

Problem 4 A 50g piece of aluminum at a temperature of 100 o C is placed in 50g of water at 20 o C. What is the final temperature of the system?

1.(4.18 J/gC)(1200g)( ) J J = (C)(125g)(62.5) J/gC x 10 3 = (.385J/gC)(454g)(Tf-23) 74 o C 4.-[(0.9J/gC)(50g)(Tf-100)] = (4.18J/gC)(50g)(Tf-20) 34 o C