Question

Use the References to Reces Important values if needed for this question 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. One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 99.57 grams of lead to 98.84 °C and then drops it into a cup containing 85.29 grams of water at 21.10 °C. She measures the final temperature to be 24.39 °C. Using the accepted value for the specific heat of lead (See the References tool), calculate the calorimeter constant. Calorimeter Constant - J°C. Submit Answer Retry Entire Group 9 more group attempts remaining

Answer 1

Given that

Speatic tteat d Pb 0160TK Calsambr Canit-at Amsunt tHet lost hy pb 2-mc AT 99.79 x0160 JSK18.84-2424) I186.17 tleat Sened h waty Amout - t 74.0T Chmlar= = 12-1J tleat gained Contant Heat Samt Calirinute choysin tampal 12 1J 1 3-23 K N+6eF

Mass of Lead = 99.57 g

Initial temperature of Pb = 98.84°C = 371.84 K

Final temperature of Pb = 24.39°C = 297.39 K

Mass of water = 85.29 g

Intial temperature of water = 21.1°C

Final temperature of water = 24.39°C

Specific heat of water = 4.184 J/g °C or 4.184 J/g-K