The heat of fusion ΔHf of toluene C6H5CH3 is 6.6 /kJmol . Calculate the change in entropy ΔS when 46.g of toluene melts at −95.0°C

Answer : The entropy change of the toluene is 18.5 J/K

Explanation :

To calculate the number of moles, we use the equation:

Given mass of toluene = 46 g

Molar mass of toluene = 92.14 g/mol

Putting values in above equation, we get:

To calculate the entropy change for different phase at same temperature, we use the equation:

where,  

= Entropy change  = ?

n = moles of toluene = 0.499 moles

= enthalpy of fusion = 6.6 kJ/mol = 6600 J/mol   (Conversion factor:  1 kJ = 1000 J)

T = temperature of the system =

Putting values in above equation, we get:

Hence, the entropy change of the toluene is 18.5 J/K

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