A gas obeys the van der Waals equation of state: =2 where a and b are positive constants. The gas undergoes an isothermal compression process. a) Does the internal energy of the gas increase, decrease or remain constant as a result of this process? (Please show/explain why). b) Under a certain set of conditions, a for this gas is approximately = 0. Under these conditions, would your answer to part a) be different? If so, does the internal energy increase,