Question

# In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine...

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.

Tfinal =  °C ?

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

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