Athermally insulated system consists of 1.00 mol of a diatomic gas at 100 k and 2.00 mol of a solid at 228 k that are separated by a rigid insulating wall. find the equilibrium temperature of the system after the insulating wall is removed, assuming that the gas obeys the ideal-gas law and that the solid obeys the dulong-petit law. hint: the gas does no work during the expansion, so qgas = ∆eint = nc'v ∆t.