Thermodynamics: Solving for Initial Temperature of Copper in Ethanol Solution

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Homework Help Overview

The problem involves a calorimetry scenario where aluminum and copper are mixed in an ethanol solution, and the goal is to determine the initial temperature of the copper based on the final equilibrium temperature of the mixture.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the application of the heat transfer formula and the need to balance heat loss and gain among the materials involved. There are attempts to calculate the heat values for ethanol and aluminum, while questioning the approach for copper.

Discussion Status

Some participants have provided guidance on the formula to use and have confirmed that the initial calculations for ethanol and aluminum appear correct. There is ongoing exploration of the calculations for copper, with no explicit consensus yet on the overall approach.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the information available for the problem. There is an emphasis on ensuring that all materials reach the same final temperature.

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Homework Statement


11 grams of Aluminium at 200 degrees Celsius and 19 grans of Copper are dropped into 49 cubic centimetres of ethanol at 15 Degrees Celsius, The temperature Quickly becomes 28 Deegres Celsuis.

What was the initial temperature of copper?

Homework Equations



Q= c dT

The Attempt at a Solution



I am very lost.. please help
 
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This is a calorimetry problem.

Cast your formula in the following form: Q = m cp (Tf - To). Balance heat loss and heat gained by all the components. And note all materials will have the same Tf.
 
ok so what i did was to find Q value for Ethanol and Aluminium

Ethanol density = .79 g/ cm3 in 49 cm3 = 0.0387 kg
Q Al = 0.011kg * (900 J /kg K) * (473.15K - 301.15K)
Q Eth= 0.0387kg (2400J/kg K) * (301.15K- 288.15K)
Q Cu = 0.019kg * (385 j /Kg K) * (301.15 - ?)

am I going well ?
 
Looks good so far.
 

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