Find the equilibrium temperature & the amount of ice/water

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SUMMARY

The discussion focuses on finding the equilibrium temperature and the amount of ice and water in a thermodynamic system. The equation presented, $$m_{\rm ice} c_{\rm ice}\Delta T_{\rm ice} + m_{\rm water} c_{\rm water} \Delta T_{\rm water} = 0$$, is central to solving the problem, emphasizing the need for clear reasoning behind each term. The conversation highlights the importance of explaining the rationale behind calculations and adhering to forum guidelines by typing out mathematical expressions instead of posting images. The final state of the system can be one of three scenarios: all liquid water above 0°C, all ice below 0°C, or a mixture of both at 0°C.

PREREQUISITES
  • Understanding of thermodynamics principles
  • Familiarity with specific heat capacity concepts
  • Knowledge of phase changes in water (ice and liquid)
  • Ability to manipulate algebraic equations
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  • Research the concept of heat transfer in thermodynamic systems
  • Learn about specific heat capacities of ice and water
  • Study phase equilibrium and the conditions for phase changes
  • Explore detailed examples of equilibrium temperature calculations
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Students studying thermodynamics, educators teaching heat transfer concepts, and anyone involved in physics or chemistry problem-solving related to phase changes and thermal equilibrium.

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Homework Statement
In an insulated vessel, 600g of ice at -20C is added to 250g of water at 18C.
Cice= 0.5 cal/gC, Cwater= 1 cal/gC. Lfusion= 80 cal/g.
Find the equilibrium temp of the system. Explain the reasons.
At the equilibrium temp, will the system be all water, all ice, or a mixture of both? Give the amounts of water and/or ice in the system at equilibrium.
Relevant Equations
Q=m*c*(Tf-Ti)
Q=m*Lfusion

Qsystem=0
Qsystem= Qice + Qwater
m*c*(Tf-Ti)ice + m*c*(Tf-Ti)water = 0
242492


That's how far I've gotten and now I'm stuck!
 
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A very important part of the question is "Explain the reasons." In your attempt you have not done that and so following your solution is a bit of guesswork. For example, when you write
$$
m_{\rm ice} c_{\rm ice}\Delta T_{\rm ice} + m_{\rm water} c_{\rm water} \Delta T_{\rm water} = 0
$$
(do not forget the subscripts!), what is your reasoning behind this?

Also, in the future, do not post images of your work. Type it out! As per forum policy.
 
The three possibilities at the final state are: (1) all liquid water above 0 C (2) all ice below 0 C or (3) a combination of liquid water and ice at 0 C. What do you think your calculation has shown so far?
 

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