The enthalpy of fusion of naphthalene,C₁₀H₈,is 19.1 kJ/mol at 78.2°C,its melting point.Calculate the entropy of fusion at the melting point.

Question

Quizplus · Accepted Answer

The entropy of fusion can be calculated using the equation:
ΔS°fus = ΔH°fus / T
where ΔH°fus is the enthalpy of fusion, T is the melting point in Kelvin.
Converting the melting point given in degrees Celsius to Kelvin:
T = 78.2°C + 273.15 = 351.35 K
Substituting the given values:
ΔS°fus = (19.1 kJ/mol) / (351.35 K) = 54.4 J/(K∙mol)
Therefore, the best choice is B.

The Enthalpy of Fusion of Naphthalene,C10H8,is 19

The Enthalpy of Fusion of Naphthalene,C₁₀H₈,is 19