Question

The following information is given for cadmium at 1atm: boiling point = 765.0 °C Hvap(765.0 °C)...


The following information is given for cadmium at 1atm:

boiling point = 765.0 °C Hvap(765.0 °C) = 889.6 J/g
melting point = 321.0 °C Hfus(321.0 °C) = 54.40 J/g
specific heat solid = 0.2300 J/g°C
specific heat liquid = 0.2640 J/g°C

A 20.60 g sample of liquid cadmium at 375.0 °C is poured into a mold and allowed to cool to 28.0 °C. How many kJ of energy are released in this process. Report the answer as a positive number.
kJ

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Answer #1

Heat lost by liquid Cd to decrease temp from ( 375 to 321) = specfici heat x temp change x mass

                              = 0.23 x ( 375-321) x 20.6 = 255.85 J

Heat lost during Cd phase change from liquid to solid = dH fusion x mass of Cd

                                                  = ( 54.4 x 20.6) = 1120.6 J

Heat lost in coooling solid Cd from 321 to 28 = 0.264 x ( 321-28) x 20.6 = 1593.45 J

Total heat = 2970 J = 2.97 KJ

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