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. A chunk of zinc weighing 18.01 grams and originally at 98.77 °C is dropped into an insulated cup containing 83.17 grams of water at 20.02 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.56 J/°C. Using the accepted value for the specific heat of zinc (See the References tool), calculate the final temperature of the water. Assume that no heat is lost to the surroundings.

T_final =  °C ?

Answer 1

Heat lose of Zn                        =         Heat gain of water

mcT                                     =           mcT

18.01*1.56*(98.77-t)                 =           83.17*4.184*(t-20.02)

         t = 25.9⁰C

The fonal temperature is 25.9⁰C