Another HELP problem: Steam to Ice

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Homework Help Overview

The discussion revolves around a thermodynamics problem involving the energy transfer required to convert steam at a high temperature into ice at 0°C. The original poster presents their calculations and equations related to specific heat capacities and phase changes.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to calculate the total energy change using specific heat and latent heat equations, but expresses uncertainty about their results. Some participants question the accuracy of constants used, particularly the heat of vaporization.

Discussion Status

Participants are actively discussing potential errors in the calculations, particularly regarding unit consistency and the values of specific heat capacities. There is no explicit consensus on the correctness of the original poster's approach, but guidance on checking units and constants has been provided.

Contextual Notes

Participants note the importance of using correct constants and units, indicating that the original poster may have overlooked these aspects in their calculations.

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Another URGENT HELP problem: Steam to Ice

Homework Statement



How many J of energy must be removed when 127.0 g of steam, at a temperature of 153.0°C, is cooled and frozen into 127.0 g of ice at 0°C? Take the specific heat of steam to be 2.1 kJ/(kg·K).

Homework Equations


Q1 = mc(delta T) <---- c= heat capacity of steam
Q2 = mLv
Q3 = mc(deltaT)<---- c=heat capacity of water
Q4 = mLf


The Attempt at a Solution



first I converted grams to kilograms and got .127kg for the mass then I follwed through with my equations
Q1 = (.127)(2100)(153-100)= 1.4135E4
Q2 = (.127)(2259.36)= 2.869E2
Q3 = (.127)(4186)(100-0)= 5.316E4
Q4 = 4.241E4

I added these up and got a total Q of 1.10E5, what am I doing wrong?
 
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he had a different problem (that is to say a different problem regarding the same problem) than me, I just need to know if I'm doing it right and when went wrong.
 
You have the constants wrong.
specifically the heat of vapourisation - the water/steam change should be the largest energy.
Just put you hand over a kettle to find out!
 
Last edited:
Q2 = (.127)(2259.36)= 2.869E2

Please check units!

I strongly recommend writing units with values, so that one properly accounts for orders of magnitude.
 
I seriously don't know how I keep messing up my units, but thanks again.
 

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