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In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Since the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter and the value determined is called the calorimeter constant. Water One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 92.57 grams of copper to 98.90 °C and then drops it into a cup containing 80.36 grams of water at 22.94 °C. She measures the final temperature to be 30.19 °C. Using the accepted value for the specific heat of copper (See the References tool), calculate the calorimeter constant. Calorimeter Constant = J/°C. Thermometer Metal- sample Stirring rod
In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. A chunk of gold weighing 18.27 grams and originally at 97.79 °C is dropped into an insulated cup containing 79.88 grams of water at 21.07 °C. I The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.51 J/°C. Using the accepted value for the specific heat of gold (See the References tool), calculate the final temperature of the water. Assume that no heat is lost to the surroundings. T final °C. = Water- Thermometer Metal- sample Stirring rod