Change in Entropy

  • #1

Homework Statement



Find the change in entropy when 2.00 kg of water at 100 degrees C is boiled away to steam at 100 degrees C. Give your answer in kJ/K

Homework Equations


deltaS=Q/T
Q=m*Lvaporization


The Attempt at a Solution


Q=m*Lvaporization
Q=2 kg * 22.6*10^5 J/kg
Q = 4.52x10^6 J

I'm not not sure how to find T though since it's at 100 degrees and going to 100 degrees...

Thanks!
 

Answers and Replies

  • #2
There's a good deal of views on here, does no one know how to do this? ;)
 
  • #3
Andrew Mason
Science Advisor
Homework Helper
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T is given. All you have to do is put it in the correct scale. The denominator in [itex]\Delta Q/T[/itex] is the absolute temperature at which the heat flows into the water.

AM
 
  • #4
Oh, I thought I had to do something more complicated with the T. Thanks!
 

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