Use the following to answer the question:
-The graph shows the temperature of a 1.0-g sample of material as heat is added to it.The material is initially a solid at 10ºC.The pressure remains constant,and there is no chemical change.The heat of fusion of the material is
A)10 cal/g
B)50 cal/g
C)30 cal/g
D)90 cal/g
E)None of these is correct.

Question

Use the following to answer the question: 
-The graph shows the temperature of a 1.0-g sample of material as heat is added to it.The material is initially a solid at 10ºC.The pressure remains constant,and there is no chemical change.The heat of fusion of the material is
A)10 cal/g 
B)50 cal/g 
C)30 cal/g 
D)90 cal/g 
E)None of these is correct.

Quizplus · Accepted Answer

The heat of fusion is the amount of heat required to change a solid into a liquid at its melting point. The graph likely shows a plateau where the temperature remains constant as the material melts, indicating the heat of fusion. The correct value is 50 cal/g, as it matches the heat required for the phase change at the melting point.

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