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Entropy Change Calculation

APCHEM-LGD1G8

The normal boiling point of molecular chlorine is 239$^o$C with a molar enthalpy of vaporization of 20.4 kJ/mol.

What is the change in entropy in the system when 142 g of the substance condenses to a liquid at the normal boiling point?

A

159 J/K

B

79.6 J/K

C

-159 J/K

D

-79.6 J/K