Answer
See the answer below.
Work Step by Step
All these values are very similar, in the range of 24.2 to 25.4, with an average of 24.8 J/mol.K.
Using the average value:
$24.8 J/mol.K\div 107.868\ g/mol=$
$0.230\ J/g.K$
Remarkably close to the actual value: $0.236\ J/g.K$