In an experiment, 74.3 g of metallic copper was heated to 100.0 degree C and the

Question

In an experiment, 74.3 g of metallic copper was heated to 100.0 degree C and then quickly dropped into 200.0 mL of water in a calorimeter. The heat capacity of the calorimeter with the water was 875 J/degree C. The initial temperature of the calorimeter was 27.5 degree C, and the final temperature after addition of the metal was 29.8 degree C. What is the value of the molar heat capacity of copper? 4.18 J/(mol middot degree C) 8.17 J/(mol middot degree C) 49.0 J/(mol middot degree C) 12.3 J/(mol middot degree C) 24.5 J/(mol middot degree C)

Explanation / Answer

In an experiment, 74.3 g of metallic copper was heated to 100.0°C and then quickly dropped into 200.0 mL of water in a calorimeter. The heat capacity of the calorimeter with the water was 875 J/C. The initial temperature of the calorimeter was 27.5°C, and the final temperature after addition of the metal was 29.8°C. What is the value of the molar heat capacity of copper? /

a. 4.18 J/(mol • °C)

d. 12.3 J/(mol • °C)

b. 8.17 J/(mol • °C)

e. 24.5 J/(mol • °C)----answer

a. 49.0 J/(mol • °C)

molar heat capacity = _     J_ _

                                   mole oC

useful relationship is       J   X     g        =        J
                                      g oC        mole            mol oC

or specific heat X molar mass = molar heat capacity

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