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Jangra S.K.,Maharshi Dayanand University | Yadav J.S.,P.A. College | Dimple N.,Aijhm College | Sharma V.K.,Maharshi Dayanand University
Journal of Chemical and Engineering Data | Year: 2010

Excess molar volumes, VE, excess molar enthalpies, H E, speeds of sound, u, and vapor-liquid equilibrium data of tetrahydropyran (1) + aniline or N-methylaniline or 2-methylaniline (2) binary mixtures have been measured over the entire mole fraction range at 308.15 K. Speeds of sound and vapor-liquid equilibrium data have been utilized to predict isentropic compressibility changes of mixing, °SE, and excess Gibb's free energy, GE. The observed VE, HE, KS S, and GE data have been analyzed in terms of Graph theory. It has been observed that VE, HE, K SS, and GE predicted by Graph theory compare well with their corresponding experimental values. © 2010 American Chemical Society. Source


Saini N.,Maharshi Dayanand University | Jangra S.K.,Maharshi Dayanand University | Yadav J.S.,Aijhm College | Sharma D.,P.A. College | Sharma V.K.,Maharshi Dayanand University
Thermochimica Acta | Year: 2011

Densities, ρ and speeds of sound, u of tetrahydropyran (i) + pyridine or α-, β- or γ- picoline (j) binary mixtures at 298.15, 303.15 and 308.15 K and excess molar enthalpies, HE of the same set of mixtures at 308.15 K have been measured as a function of composition using an anton Parr vibrating-tube digital density and sound analyzer (model DSA 5000) and 2-drop micro-calorimeter, respectively. The resulting density and speed of sound data of the investigated mixtures have been utilized to predict excess molar volumes, VE and excess isentropic compressibilities, κSE. The observed data have been analyzed in terms of (i) Graph theory; (ii) Prigogine-Flory-Patterson theory. It has been observed that VE, HE and κSE data predicted by Graph theory compare well with their experimental values. © 2011 Elsevier B.V. Source


Neeti,Maharshi Dayanand University | Jangra S.K.,Maharshi Dayanand University | Yadav J.S.,Aijhm College | Dimple,P.A. College | Sharma V.K.,Maharshi Dayanand University
Thermochimica Acta | Year: 2011

The densities ρ, speed of sound u, data of o-toluidine (i) + tetrahydropyran (j) + N-methylformamide (k) and its sub-binary o-toluidine (i) + tetrahydropyran (j); tetrahydropyran (j) + N-methylformamide (k); o-toluidine (i) + N-methylformamide (k) mixtures have been measured over entire mole fraction at 298.15, 303.15 and 308.15 K. The excess molar enthalpies, H E data of o-toluidine (i) + N-methylformamide (k); tetrahydropyran (j) + N-methylformamide (k) binary mixtures have also been measured as a function of composition at 308.15 K. The densities and speeds of sound of binary and ternary mixtures have been utilized to determine their excess molar volumes, VE and excess isentropic compressibilities, κSE. The topology of the constituents (Graph theory) has been employed to determine VE, HE and κSE data of binary as well as ternary mixtures. It has been observed that the estimated excess properties compare well with their corresponding experimented values. © 2011 Elsevier B.V. Source


Sharma V.K.,iversity | Rohilla A.,iversity | Yadav J.S.,Aijhm College | Solanki S.,iversity | Sharma D.,P.A. College
Journal of Chemical and Engineering Data | Year: 2013

The excess heat capacities, CPE of 1-methylpyrrolidin-2-one (1) + o-, m-, or p-chlorotoluene (2) and pyrrolidin-2-one (1) + o-, m-, or p-chlorotoluene (2) binary mixtures have been measured as a function of composition at (293.15, 298.15, and 303.15) K using microdifferential scanning calorimetry. The CPE data have been fitted to Redlich-Kister equation to calculate binary adjustable parameters and standard deviations. The measured properties of the studied mixtures have been analyzed in terms of Graph theory (which deals with the topology of the constituent of mixtures). It has been observed that Graph theory describes well the CPE data of the investigated binary mixtures. © 2013 American Chemical Society. Source


Sharma V.K.,Md University | Bhagour S.,Md University | Solanki S.,Md University | Sheetal,Bhagwan Parshuram College | Jangra S.K.,Aijhm College
Journal of Chemical Thermodynamics | Year: 2014

Excess molar enthalpies, HijkE of ternary 1-ethyl-3-methylimidazolium tetrafluoroborate (i) + Pyrrolidin-2-one (j) + Pyridine or Water (k); 1-ethyl-3-methylimidazolium tetrafluoroborate (i) 1-methyl pyrrolidin-2-one (j) + Pyridine or Water (k) and HE of Pyrrolidin-2-one (i) + Pyridine or Water (j); 1-methyl pyrrolidin-2-one (i) + Pyridine (j); 1-ethyl-3-methylimidazolium tetrafluoroborate (i) + Water (j) mixtures have been measured over entire mole fraction range at 298.15 K. The HijkE value for 1-ethyl-3-methylimidazolium tetrafluoroborate (i) + Pyrrolidin-2-one (j) + Water (k); 1-ethyl-3- methylimidazolium tetrafluoroborate (i) + 1-methyl pyrrolidin-2-one (j) + Pyridine or Water (k) are positive over whole range of composition and for 1-ethyl-3-methylimidazolium tetrafluoroborate (i) + Pyrrolidin-2-one (j) + Pyridine (k) mixture, the sign of HijkE values varies with change in composition of the components. The observed data have been analyzed in terms of (i) Graph; and (ii) Prigogine-Flory-Patterson (PFP) theories. Results indicate that HE and HijkE values obtained by Graph theory are in good agreement with experimental data. The PFP theory correctly predict sign as well as magnitude of HE values for the binary mixtures. However, theory fails to predict the sign of H ijkE values for the ternary mixtures. © 2013 Elsevier Ltd. All rights reserved. Source

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