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Q: System and Equilibrium ( No Answer,   2 Comments )
Subject: System and Equilibrium
Category: Science > Physics
Asked by: alwysnforevr002-ga
List Price: $2.00
Posted: 22 Jul 2006 17:52 PDT
Expires: 21 Aug 2006 17:52 PDT
Question ID: 748637
A 0.10 kg piece of copper at an initial temperature of 95?C is dropped
into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. The
water and calorimeter are initially at 15?C. What is the final
temperature of the system when it reaches equilibrium?

Request for Question Clarification by hedgie-ga on 22 Jul 2006 20:36 PDT
A 0.10 kg + 0.20 kg  = .30 kg

may not fit into 0.28 kg aluminum calorimeter

Anyway, what does 0.28 kg calorimeter mean?

 It has a mass of .28 kg (when empty? when filled with what?)

A would give D- to a teacher who dreamed up this homework.
There is no answer at this time.

Subject: Re: System and Equilibrium
From: anonymous3141-ga on 22 Jul 2006 20:58 PDT
Again a simple heat balance question
Subject: Re: System and Equilibrium
From: physci-ga on 23 Jul 2006 14:56 PDT
This is typical data from calorimeter experiments commonly performed in
introductory labs:

Heat Loss = Heat Gain

Specific heat Al = .22 cal/gm deg C
Specific heat Cu = .093 cal/gm deg C
Heat Loss = (95 - Tfinal) * .093 cal/gm * 100g

Heat Gain = (Tfinal - 15) [(200g * 1 cal/gm) + (280gm * .22 cal/gm)]

(I left out the units for temperature)
I obtained 19 deg C for the final temp but you better check the math
(Actually 19.05 but you only have 2 significant figures for the specific heats.

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