True (T) or False (F) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 In a closed system, mass cannot flow in or out but energy can be added or removed. If the first law of thermodynamics is simplified to Q = AH (i. e. W = 0, Ex = 0 and Ep = 0), it means that heat is NOT a path dependent thermodynamic function because it is equal to the change in enthalpy which is not a path function. The Gibbs phase rule indicates that the degree of freedom of at the triple point is zero. The Lee-Kesler method could be used to find the molar volumes of the equilibrium phases at very high pressure. Carbon dioxide is a sub-cooled liquid at 60 bar and 400 K A supercritical fluid is a fluid at a temperature above the critical temperature. Work is a thermodynamic property. Thermodynamics is the science that studies energy interactions between system and surrounding. The compressibility factor (Z) is equal to 1 for ideal gas. Nitrogen is always a gas at room temperature. If you leave an open cup of tea at 20 °C for long time in a room, it will eventually reach to an equilibrium state because the pressure and temperature are constant in the room. If you leave an open cup of tea at 20 °C for long time in a room, it will eventually reach to an equilibrium state because the pressure and temperature are constant in the room. The last density at which vapor and liquid exist at equilibrium is the critical density. An example of a process is the increase of human body from 37 °C to 38 °C, The Gibbs phase rule (the degree of freedom) could be equal to zero. An intensive property depends on how much of the substance is present. At some state conditions, it is possible to convert a superheated gas into solid only by cooling. If the first law of thermodynamics is simplified to AU = Q for a specific problem, it means that heat could be obtained from the final state minus the initial state. The concept of the corresponding states could be applied to van der Waals equation of state. The attractive forces between molecules would cause an increase in the pressure of the gas in a cylinder A solid sublimes only when the pressure of its vapor is below that of the triple point for that substance. The quality of cars is improving from year to year. Therefore, car manufacturer companies will be capable in the future to develop very efficient engines that would be capable to convert heat completely into mechanical work. The vapor pressure is the pressure at equilibrium The acentric factor is one for spherical molecules The molar volume of the vapor is less the molar volume of liquid The second law of thermodynamics states that temperature is a state property The molar volume of supercritical fluid could be calculated by Lee-Kesler method At the critical point, there is also a critical internal energy. Saturated liquid density is a thermodynamic property at equilibrium The compressibility factor (Z) of liquid is lower than that of gases 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30