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

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 student heats65.62grams ofzincto98.24 °C and then drops it into a cup containing75.87grams of water at23.87 °C. She measures the final temperature to be29.24 °C. The heat capacity of the calorimeter (sometimes referred to as thecalorimeter constant) was determined in a separate experiment to be1.54J/°C. Assuming that no heat is lost to the surroundings calculate the specific heat ofzinc. what is the Specific Heat (Zn) = ? J/g°C.

Solutions

Expert Solution

Heat lost by hot zinc = heat gained by water + heat gained by calorimeter

Specific heat of Zinc x temp change of zinc x mass of zinc = specific heat of water x temp change x mass of water

                                                                                               + specific heat of calorimeter x temp change

S x ( 98.24-29.24) x 65.62 = (4.184 x ( 29.24-23.87) x 75.87) + ( 1.54 x ( 29.24-23.87)

S x 4527.78 = 1704.653 + 8.2698

S = 0.3783 J/gC is specifi heat of zinc

queen_honey_blossom answered 2 years ago
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