Homework Help: college chem

Posted by Sarah on Thursday, October 8, 2009 at 4:30pm.

In this experiment a hot metal block at 100oC is added to cold water in a calorimeter. The heat lost by the metal block equals the heat gained by the water and the two end up at the same temperature.

In one experiment, the mass of the metal block is 89.5 grams, the volume of water used is 75.6 mL, the temperature of the cold water extrapolated to the time of mixing is 18.2oC, and the temperature of the metal block and water extrapolated back to the time of mixing is 28.3oC.

The specific heat of water is 4.184 J K-1g-1

How much heat is gained by the cold water?

Heat gained by cold water = ____ J

What is the specific heat of the metal?

Specific heat of the metal= ___J K-1g-1

According to the Law of Dulong and Petit, what is the molar mass of the metal?

Molar mass = ____ g mol-1

college chem - DrBob222, Thursday, October 8, 2009 at 6:28pm
mass metal x specific heat metal x (Tfinal-Tinitial) + mass water x specific heat water x (Tfinal-Tinitial) = 0

You can pick out the pieces you want from above to answer your questions.

For Dulong and Petit.
heat capacity = about 24.9 J/mol*K. (about 6.3 calories/g*C

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