Eda Cw1 Essay

639 Words Dec 19th, 2014 3 Pages
Principle of Corresponding States Experimental observation shows that compressibility factors Z for different fluids exhibit similar behavior when correlated as a function of reduced temperature Tr and reduced pressure Pr.All fluids, when compared at the same reduced temperature and the reduced pressure, have approximately the same compressibility factor (Z)and all deviate from ideal gas behavior to about the same degree.

Internal energy .Internal energy (U) refers to the energy stored in the system by virtue of the configuration and motion of the molecules of the system. *Internal energy is a definite property of the system unlike kinetic energy and potential energy of the system as a whole. *Absolute values of internal energy cannot
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2. The partial molar property of a particular component in a mixture measures the contribution of that component to the mixture property. 3. if M" is the total value of any extensive thermodynamic property of a solution, the partial molar property M, of the component i in the solution where n is the total number of moles and M is the molar property of the solution. n, denotes the number of moles of component I in solution , so that n = In, for 1 mole of a solution it can be shown that M = x1M, (1) Thus the molar volume V of a solution made up of components 1,2...... can be written as

DUHEM EQUATION Consider any thermodynamic extensive property such as volume, free energy, heat capacity etc. its value, for a homogeneous system, being completely determined by the temperature, pressure and the amounts of various constituents present. Let M be the molar property of a solution and Mt be the total property. Then Mt = nm, where n is n1+ n2 + n3 + Here, n1 + n2 + n3 + ....are the number of moles of the respective components 1,2 3,... of the system. The solution property is a function represented by Mt = f (P,t, ni, n2, n3, ...) In general the macroscopic properties of homogeneous PVT systems at internal equilibrium can be expressed as functions of temperature, pressure, and composition only.

Significance of the Gibbs Duhern relations : ln a binary mixture, if the partial molar property of one of the component increases , the

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