Please answer all of them Enthalpy and Entropy for Phase Changes Part A For each

Question

Please answer all of them Enthalpy and Entropy for Phase Changes Part A For each phase change, determine the sign of H and Drag the appropriate items to their respective bins Matter can change from one physical state (phase) to another without any change in chemical identity. Each change is characterized by a specific name, a H (enthalpy) value, and a AS (entropy) value. The energy nvolved in phase changes and temperature changes can be calola ted by using the following equations. For a phase change (with no change in temperature) whire H is the enthalpy change for that transiton and n is the number of moled of the substance For a temperature change (with no change in phase) where C is the molar heat capacity, a is the number of meles, and T is the temperature change in degrees Celsius AHAS H,-AS AH-A

Explanation / Answer

Part A

sublimation          delta H = + ve      delta S = + ve

freezing              delta H = - ve      delta S = - ve

condensation        delta H = - ve      delta S = - ve

deposition            delta H = - ve      delta S = - ve

boiling                   delta H = + ve      delta S = + ve

melting                  delta H = + ve      delta S = + ve

Part B

1. -10 C to 100 C

2. ice to liquid water

3. 0 C to 125

4. liquid water to steam

5. 100 to 125 C

problem 10.8

part A

Tboil = delta H/delta s

         = 29200/87.5  

Tboil = 333.7 K

Chapter 10

Part A

Tboil = delta H/delta s

         = 38600/110  

Tboil = 351 K

or 78 degree celcius

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