An ideal gas, with temperature-independent C_P = (7/2)R, at 15°C and having an initial volume of 60 m³, is heated at constant pressure (P = 0.1013 MPa) to 30°C by transfer of heat from a reservoir at 50°C. Calculate ΔS_gas, ΔS_{heat reservoir}, ΔS_universe. What is the irreversible feature of this process?