The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is .

(Specific heat of water liquid and water vapour are and ; heat of liquid fusion and vaporizat

Question

The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is .

(Specific heat of water liquid and water vapour are  and ; heat of liquid fusion and vaporization of water are  and , respectively). (, , )

(1)   (2)   (3)   (4)

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Strategy:
 The total entropy change is the sum of entropy changes for each stage: fusion at constant T, liquid heating, vaporization at constant T, and vapor heating.

Step 1: Calculate each stage (per kg)
-  (Fusion): 
-  (Heating liquid): 
-  (Vaporization): 
-  (Heating vapor):

Step 2: Sum
.

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