The heat of fusion of acetone is 5.7 kJ/mol. Calculate to two significant figures the entropy change when 6.3 mol of acetone melts at its melting point of -94.7C at constant pressure

The entropy change of the process is

Explanation:

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

where,  

= Entropy change

n = moles of acetone = 6.3 moles

= enthalpy of fusion = 5.7 kJ/mol = 5700 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 process is