What mass of the ethanol is she freezing?

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Homework Help Overview

The problem involves determining the mass of ethanol being frozen by removing a specific amount of heat energy at its melting point. The subject area relates to thermodynamics and phase changes.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the need for specific equations related to heat energy and temperature changes, questioning what information is necessary to solve the problem. Some express uncertainty about the equations and concepts involved.

Discussion Status

The discussion is ongoing, with participants exploring different equations and concepts relevant to the problem. Some guidance has been offered regarding the need for specific heat capacity and temperature values, but no consensus has been reached on the approach to take.

Contextual Notes

Participants note the importance of understanding the relationship between heat energy, temperature changes, and phase transitions, while also recognizing the need for specific data about ethanol.

MacoRules94
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A technician freezes some ethanol by removing 9.53x10^4 J of heat energy from it at its melting point. What mass of the ethanol is she freezing?
 
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MacoRules94 said:
A technician freezes some ethanol by removing 9.53x10^4 J of heat energy from it at its melting point. What mass of the ethanol is she freezing?

What equation do you think you need to use here? What information do you think you need to have to work out this problem?
 


No idea
 


MacoRules94 said:
No idea

Wouldn't the technician have to lower the temperature to the freezing point? Do you know an equation that related heat energy to temperature?
 


No ida
 


MacoRules94 said:
No ida

Do you know the equations Q=mcΔT and Q=ml ?
 


Yes

Q = Mas x (umm, 4200 for water :) ) x (Tf - To)
 


You will need to get the specific heat capacity of ethanol, the melting and freezing temperatures. Look those up.
 

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