A frictionless piston–cylinder device and a rigid tank contain 2 kmol of an ideal gas at the same temperature, pressure, and volume. Now heat is transferred, and the temperature of both systems is raised by 10°C. The amount of extra heat that must be supplied to the gas in the cylinder that is maintained at constant pressure is
(a) 0 kJ
(d) 102 kJ
(b) 42 kJ
(e) 166 kJ
(c) 83 kJ