Answered: A 689.00g block of gold ( cgold=129 J…

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter21: Heat And The First Law Of Thermodynamics

Section: Chapter Questions

Problem 68PQ

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Question

A 689.00g block of gold (

c_gold=129

kg°C

) initially at

15.00°C

is placed in thermal contact with an unknown mass of aluminum (

c_alum=900

kg°C

) initially at

90.00°C

. If they equilibrate at a final temperature of

68.00°C

, what is the mass of the aluminum?

What assumption do we make when solving calorimetry problems like this?

We can only have two substances in thermal contact. The substances are in a closed, isolated container that does not allow any energy to enter or leave the system. The two substances must have different specific heats. Some of the energy transferred from one substance is lost to its surroundings and does not go to the other substance.

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