Answer : The entropy change of the dichloromethane is 142 J/K
Explanation :
To calculate the number of moles, we use the equation:
Given mass of dichloromethane = 345 g
Molar mass of dichloromethane = 84.93 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 dichloromethane = 4.06 moles
= enthalpy of fusion = 6.2 kJ/mol = 6200 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 dichloromethane is 142 J/K