Hi, could I get some help with this macro-connection physics problem involving adiabatic free expansion and entropy?

The set up is:

For an isothermal reversible expansion of two moles of an ideal gas with adiabatic free expansion in a rigid container as in the picture, what is the entropy change of the a) gas (if the volume only doubles instead of quadruples) and b) the surroundings in J/K to 4 digits of precision, assuming N_A = 6.022e23 and k_B = 1.38e-23 J/K)?