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15 Nov 2019
True or False? Please, explain (a) Since the three possible phases are solid, liquid, and gas, the max- imum possible value of the number of phases p in the phase rule is 3 (b) The number of degrees of freedom f is the number of variables needed to specify the thermodynamic state of the system (c) The minimum possible value of f in the phase rule is 1 (d) Along a line in a one-component phase diagram, f 1 (e) At the critical point of a pure substance, the densities of the liquid and the vapor are equal point the critical point. (f) The enthalpy of vaporization of a liquid becomes zero at critical (g) The relation d In P/dT AHm/RT2 should not be applied near (h) Increasing the area of a liquid-vapor interface increases U of the (i) The surface tension of a liquid goes to zero as the critical temper- (j) When three phases coexist in equilibrium in a one-component sys- system ature is approached tem, one of the phases must be a gas, one must be a liquid, and one must be a solid
True or False? Please, explain (a) Since the three possible phases are solid, liquid, and gas, the max- imum possible value of the number of phases p in the phase rule is 3 (b) The number of degrees of freedom f is the number of variables needed to specify the thermodynamic state of the system (c) The minimum possible value of f in the phase rule is 1 (d) Along a line in a one-component phase diagram, f 1 (e) At the critical point of a pure substance, the densities of the liquid and the vapor are equal point the critical point. (f) The enthalpy of vaporization of a liquid becomes zero at critical (g) The relation d In P/dT AHm/RT2 should not be applied near (h) Increasing the area of a liquid-vapor interface increases U of the (i) The surface tension of a liquid goes to zero as the critical temper- (j) When three phases coexist in equilibrium in a one-component sys- system ature is approached tem, one of the phases must be a gas, one must be a liquid, and one must be a solid