For each system listed in the first column of the table below, decide (if possible) whether the change described in the second column will increase the entropy of the system, decrease S, or leave S unchanged. If you don't have enough information to decide, check the "not enough information" button in the last column. Note for advanced students: you may assume ideal gas and ideal solution behaviour.
20. L of pure carbon dioxide (CO2) and gas and 20.0 L of pure helium (He) gas, both at 3 atm and -7°C.