CHEM 1211 Module Seven Exam Name: ___________________

Module Seven Part C: Specific Heat/First Law Problems 4 points

The specific heat capacity of gold is 0.128 J/Kg, the specific heat capacity of iron is 0.451 J/Kg and the specific heat capacity of aluminum is 0.917 J/Kg. Calculate the molar heat capacity of the three metals:

a. Gold:

b. Iron

c. Aluminum

d. Compare the three values and what conclusion can you draw?

100 J of work are required to compress a gas. At the same time, the gas gives off 23J of heat to the surroundings. What is the change in the energy of the system.

Answers:

a.molar heat capacity of gold= 25.2 J/Kmol

b. molar heat capacity of gold = 25.2 J/Kmol

c. molar heat capacity of aluminum 24.8 J/K mol

d. The molar heat capacities of all metals at room temperature are approximately the same (theoretically = 3R = 24.9 J/Kmol)

77J