
#1
Nov2111, 03:17 AM

P: 3

1. The problem statement, all variables and given/known data
1. The problem statement, all variables and given/known data Calculate the entropy change when 1 mole of ice at 268 K is melted to form water at 323 K. The heat capacity of ice is 3.8 J K1 kg1 and that of water is 75 J K1 kg1. The enthalpy of fusion of ice at 273 K is 6.02 kJ mol1. I know the entropy change by the melting of the ice is given by delta(S)=delta(Q)/T and that this is worked out by the enthalpy of fusion. My question is how do I calculate the entropy change caused by the change in temperature since it is not at a constant temperature does this mean the first equation cannot be used? Also this isn't a homework question it is an exam question from a previous year and my exam is tomorrow. Not sure whether this should be in here or in other sciences catagory 



#2
Nov2111, 06:59 AM

Mentor
P: 11,452

Q = M*C*T Differentiating: dQ = M*C*dT So your equation for the change in entropy becomes an integral over the temperature change. 


Register to reply 
Related Discussions  
Calculation of entropy change for melting ice  Biology, Chemistry & Other Homework  1  
Phase change! Melting ice with hot tea.  Introductory Physics Homework  6  
melting entropy  Chemistry  0  
entropy change during phase change: system, surroundings, and if it's reversible  Advanced Physics Homework  1 