A 0.632 kg sample is placed in a cooling apparatus that removes energy as heat a
ID: 2224670 • Letter: A
Question
A 0.632 kg sample is placed in a cooling apparatus that removes energy as heat at a constant rate. The figure gives the temperature T of the sample versus time t; the horizontal scale is set by ts = 136.0 min. The sample freezes during the energy removal. The specific heat of the sample in its initial liquid phase is 3030 J/kg-K. What are (a) the sample's heat of fusion and (b) its specific heat in the frozen phase?
I used :
Q=mL and Q=mC?T for Lf=c?T and C=Lf/?T where mass cancels.
a) I used delta T=290K-280K=10K, and b) delta T=280K-260K=20K
My answers are both wrong. Can someone please show me the error of my ways....Thank you!
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