1. Mar 7, 2010 #1

   Alvine

   

   Hi guys, is this right?
   
   1. The problem statement, all variables and given/known data
   A mole of nitrogen is heated at constant external pressure of 1 atm from 25° C to 100° C. The heat capacity of nitrogen is 29.1 J/mol·K.
   
   Calculate ΔSsurr
   
   
   
   
   2. The attempt at a solution
   delta_S=Q/T = -1*29.1*75/373=-5.85 J/K
   
   (heat transferred to the system divided by T_surr which we assume to be equal to T_final)
   
   The solution in my lecture notes says -22 J/K, I can't see where that came from.

    

   Alvine, Mar 7, 2010
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3. Mar 7, 2010 #2

   lightgrav

   

   Homework Helper

   even if they heat it "infinitely slow", it only goes up to about 6½ J/K ,
   no-where near 22 J/K .
   { they must've divided by 100 degrees C by mistake , rather than 373 K }

    

   lightgrav, Mar 7, 2010

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