How Do You Calculate Heat Released When Steam Turns to Ice?

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Homework Help Overview

The problem involves calculating the heat released when steam is converted to ice, specifically focusing on the phase changes and temperature changes involved in the process.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the necessary steps for the calculation, including cooling the steam, condensing it to water, cooling the water to the freezing point, freezing the water, and cooling the resulting ice. There are questions about the setup of the problem and the appropriate equations to use.

Discussion Status

Some participants have offered insights into the phases involved and the heat transfer equations, while others are questioning the definitions of certain terms and the overall setup of the problem. There is an ongoing exploration of how to correctly account for the heat changes at each stage.

Contextual Notes

Participants are working within the constraints of a homework assignment, which may limit the information they can share or the methods they can use. There is a focus on understanding the relationships between the different phases and temperature changes without providing direct solutions.

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Homework Statement



How much heat is released freezing 75 grams of steam at 110 degrees celsius into ice at -5.1 degree celsius

Homework Equations






The Attempt at a Solution

I tried to do this problem but got an answer like -17101.6J. I don't need you guys to give me an answer but can you suggest how to setup a problem like this? I know Qlost+Qgained=0...so would the 2 phase changes (steam to liquid, liquid to solid) =0?
 
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Several parts:
- cooling the steam
- condensing the steam to water
- cooling the water to freezing point
- freezing
- cooling the ice
 
So would I have (Msteam*Lheatsteam)+(Mwater*Lheatwater)+(Mice*Lheatice)+(Mice*Sice+change in temp ice)=0?
 
(Mice*Sice+change in temp ice)=0?
Certainly not equal to zero - equal to the heat released that you are trying to find.

I don't know what "Sice" means. I would say
M*C*ΔT for each of the three coolings, where M is the mass, C the heat capacity per kg per degree and ΔT the change in temperature.
 

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