Question

At $0{}^{o}C$, if the enthalpy of fusion of ice is 1365 $kcal/mol$. Then, the molar entropy change for melting of ice at $0{}^{o}C$ in $kJ/mol$ is.

Answer 1

Change in entropy for a phase transformation is given as:
$△S_{\text{transformation}}=\frac{△H_{\text{transformation}}}{T}$

putting all the values from question we get:

$△S_{fusion}=\frac{△H_{fusion}}{T}$

$△S_{fusion}=\frac{1365}{273}$

$△S_{fusion}=5kcal/mol$
as $1cal=4.18J$

$△S_{fusion}=20.9kJ/mol$