The valve of a cylindrical tank containing gas is partially opened to regulate the flow. This expansion process takes place at a constant temperature of 350 K. Since the gas complies with the equation of state given below, find the enthalpy change (J/mol) when the pressure of the tank is 13 bar and the external pressure is 1 bar. (=10 cm^3/mol) (chemical engineering thermodynamics question and options for answer: 24,-16,19,29,-12)

Z=1 + (/RT).P