If 24,500 kJ of work is done in a cylinder when 115 kg of a perfect gas is expanded isothermally at 210°C from 0.035 m³ to 6.9 m³. Find the characteristic constant for this gas.
A. 0.083 kJ/kg K
B. 0.198 kJ/kg K
C. 0.421 kJ/kg K
D. 0.441 kJ/kg K
E. 0.489 kJ/kg K
Answer: A