lecture28

# lecture28 - 12.7(cont Calorimetry Calorimetry is a...

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12.7 (cont.) Calorimetry Calorimetry is a technique that one can use to determine the specific heat of an unknown substance. The technique is based on the conservation of energy. The unknown material with a mass m and o temperature T o is placed into a calorimeter. The heat (internal energy) lost by the unknown material must go into heating up the water and the calorimeter cup. The calorimeter cup is well insulated to reduce the heat lost to the environment. Heat lost by unknown material = Heat gained by container + Heat gained by the water Q Q Q Δ + Δ = Δ w c o Heat lost by unknown material Heat gained by container Heat gained by water w w w c c c o o o T m c T m c T m c Δ + Δ = Δ From this equation, we can determine c o , the heat capacity of the unknown sample.

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Example : A precious-stone dealer wishes to find the specific heat capacity of a 0.030-kg gemstone. The specimen is heated to 95.0 o C and then placed in a 0.15-kg copper essel that contains 0 080 kg of water at equilibrium at 25 0
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## This note was uploaded on 08/04/2009 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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lecture28 - 12.7(cont Calorimetry Calorimetry is a...

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