The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of `10 dm^(3)` to a volume of `100dm^(3)` at `27^(@)C` is
A. `42.3J" "mol^(-1)K^(-1)`
B. `38.3J" "mol^(-1)K^(-1)`
C. `35.8J" "mol^(-1)K^(-1)`
D. `32.3J" "mol^(-1)K^(-1)`