3) as a hot air balloon is expanded, 1.45 x 185 kj of heat is absorbed. assume the size of the balloon
grows from 1,500,000 l to 4,500,000 l against a pressure of 0.975 atm. what was the change in internal
energy and enthalpy during this process? the conversion factor needed is 101.3 ) = 1.00 leatm.