CHEM
posted by Cory .
One piece of copper jewelry at 101°C has exactly twice the mass of another piece, which is at 36.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter (c of copper = 0.387 J/gK)?

heat lost by piece 1 + heat gained by piece 2 = 0
[mass jewl 1 x specific heat x (TfinalTinitial)]+[mass jew2 x specific heat x (TfinialTinitial)] = 0 
I don't understand it still.

heat lost by one object + heat gained by another object ALWAYS will reach equilibrium at some intermediate temperature. For example, if you have a 2g piece of iron at 20C and another 2 g piece of iron at 30C, you put them together so they can exchange heat, the final temperature will be 25C. Ergo, the 30 C piece of iron lost 5C and the 20 C piece of iron gained 5C.
Your jewelry problem isn't QUITE that simple because they don't weigh the same AND they are at uneven temperatures (not a simple 20 and 30C).
So heat lost or gained is
mass x specific heat metal x (TfinalTinitial).
The mass isn't given, so make up a mass for the first one that is convenient, say 20 g; that makes the second piece of jewelry 10 g. What is the specific heat Cu. That's 0.387 in the problem.
[20 x 0.387 x (Tfinal101)] + [10 g x 0.387 x (Tfinal36)]= 0
The ONLY unknown is Tfinal. Solve for that. 
Thanks Bob, this helped!
Respond to this Question
Similar Questions

Chemistry
Need Help with these two problems 1.One piece of copper jewelry at 111°C has exactly twice the mass of another piece, which is at 36.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the … 
Chemistry
One piece of copper jewelry at 101°C has exactly twice the mass of another piece, which is at 36.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter … 
physics
A copper calorimeter of mass ()g contains 380g of a liquid at 12degrees Celsius. A 20W heater is used for 3 minutes to raise the temperature of the liquid and calorimeter to 17 degrees Celsius. The calorimeter has a specific heat capacity … 
Chemistry
A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat … 
Chemistry
A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat … 
Chemistry
A piece of copper metal is initially at 100.0°C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20.0°C. After stirring, the final temperature of both copper and water is 25.0°C. Assuming … 
chemistry
one piece of copper metal at 105 C has twice the mass of another copper piece at 45 C. What is the final temperature if these two pieces are placed in a calorimeter. Specific heat of copper is 0.387 J/g.K. 
Science
A piece of copper at 90°C is added 2.200 KG of water at 15°C inside an aluminum calorimeter that has a mass of .100 KG the final temperature of the copper water and calorimeter is 25°C what is the mass of the copper piece 
chemistry
One piece of copper jewelry at 104°C has exactly twice the mass of another piece, which is at 43.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter … 
physics
A piece of copper ball of mass 20g at 200°c is placed in a copper calorimeter of mass 60g containing 50g of water at 30°c ignoring heat losses.calculate the final steady temperature of mixture.(specific heat capacity of water=4.2jg1k1)