What is the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies.

The change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies is 20 cal/K.

Explanation:

T is the temperature at which the process is carried out, here the temperature is constant, 327.5°C = ,because only phase change occurs.

q =  heat given in the process =

m = mass of lead = 2.0 kg

= latent heat of fusion of lead =  5.9 kcal/kg

Thus the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies is 20 cal/K.

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