Equilibrium temperature with 2 states of matter

AI Thread Summary
The discussion centers on calculating the final equilibrium temperature when 35g of water vapor at 380K mixes with 300g of liquid water at 300K. It is confirmed that the heat capacity of water vapor differs from that of liquid water. The calculated final temperature of about 290K raises questions, as it is lower than the initial temperature of the liquid water, suggesting heat loss during the condensation process. Additionally, it is clarified that heat capacity cannot be calculated using the enthalpy of condensation. The conversation emphasizes the importance of understanding the different properties of water in its various states.
jlau
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You have to show your attempts, this is a forum policy. Also, all homework like questions should go to homework forum.
35g of h2o(g) at 380K flows into 300g of h2o(l) at 300K. Cp(l)=4.18kJ/K*kg and ΔH(condensation)= -2257kJ/kg.
I need to calculate the final temperature when the system reaches equilibrium.

Is the heat capacity for the h2o gas different than h2o liquid? Can you calculate heat capacity using ΔH(condensation)?

The answer I got when I used the same heat capacity was about 290K. Which I thought was odd considering the liquid water started at 300K and the gas was even hotter than that. could this be because heat was lost during condensation of the steam?
 
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jlau said:
Is the heat capacity for the h2o gas different than h2o liquid?

Yes.

Can you calculate heat capacity using ΔH(condensation)?

No.
 
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