Solution -
1. The entropy change S is given by
S = Q / T
Heat Supplied to solid ( Q ) = mLf and the solid will melt at constant temperature Tm .
Hence entropy change S is given by
S = mLf / Tm
2. Ans -
Lf = 3.33 x 105 J / Kg
m = 30 g = 0.03 Kg
Tm = 273 k ( Assuming the atmospheric pressure and temperature at which ice is kept so ice will melt at 0oC or 273 k )
S = mLf / Tm
S = ( 0.03 x 3.33 x 105 ) / 273
S = 36.593 J / K
Thank you.
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