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2016
This chapter addresses enthalpy, which plays a role wherever processes taking place at constant pressure, a common condition in chemistry, are studied. The enthalpy of a system, a state function, is introduced in order to take energy changes arising from expansion work into account automatically.
Peter Atkins +2 more
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This chapter addresses enthalpy, which plays a role wherever processes taking place at constant pressure, a common condition in chemistry, are studied. The enthalpy of a system, a state function, is introduced in order to take energy changes arising from expansion work into account automatically.
Peter Atkins +2 more
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2013
Contents The definition of enthalpy 552 Brief illustration 56.1: The change in enthalpy 553 Heat capacity at constant pressure 553 Example 56.1: Evaluating an increase in enthalpy with temperature 554
Peter Atkins +2 more
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Contents The definition of enthalpy 552 Brief illustration 56.1: The change in enthalpy 553 Heat capacity at constant pressure 553 Example 56.1: Evaluating an increase in enthalpy with temperature 554
Peter Atkins +2 more
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Thermochimica Acta, 2016
© 2016 Elsevier B.V. All rights reserved.Enthalpy of sublimation of solid compound can be found using the values of solution enthalpy and solvation enthalpy in any solvent. In this work enthalpies of solution at infinite dilution of a number of aromatic hydrocarbons derivatives in benzene were measured at 298.15 K.
Solomonov B. +4 more
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© 2016 Elsevier B.V. All rights reserved.Enthalpy of sublimation of solid compound can be found using the values of solution enthalpy and solvation enthalpy in any solvent. In this work enthalpies of solution at infinite dilution of a number of aromatic hydrocarbons derivatives in benzene were measured at 298.15 K.
Solomonov B. +4 more
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The Journal of Chemical Thermodynamics, 1989
Abstract Measurements of the specific enthalpy increment of ethanol are reported; 139 measurements cover the range 393.2 to 573.2 K at pressures from 0.1 to 10.05 MPa. The overall accuracy is 0.5 per cent. Values of the specific enthalpy of vaporisation derived from the measurements are in good agreement with other work and are well fitted by a ...
M.D. Vine, C.J. Wormald
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Abstract Measurements of the specific enthalpy increment of ethanol are reported; 139 measurements cover the range 393.2 to 573.2 K at pressures from 0.1 to 10.05 MPa. The overall accuracy is 0.5 per cent. Values of the specific enthalpy of vaporisation derived from the measurements are in good agreement with other work and are well fitted by a ...
M.D. Vine, C.J. Wormald
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Enthalpy, heat capacity and enthalpy of transformation of Li2TiO3
Journal of Nuclear Materials, 2001Abstract The enthalpy of β- and γ-Li2TiO3 (Li/Ti=1.88) was measured between 397 and 1650 K by isothermal drop calorimetry. The smoothed enthalpy curve between 298 and 1700 K results in H°(T)−H°(298 K )=−49181+131.876T+0.011097T 2 +2651112T −1 J / mol (298–1410 K) and H°(T)−H°(298 K )=+49729+50.517T+0.031679T 2 ...
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Enthalpy distributions in proteins
Biopolymers, 2000Experimental data on the temperature dependence of the heat capacity of proteins can be used to calculate approximate enthalpy distributions for these molecules using the maximum-entropy method. C(p) (T) data is first used to calculate a set of moments of the enthalpy distribution, and these are then used to estimate the enthalpy distribution.
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Enthalpy of formation and enthalpy of mixing of calcium and cadmium hydroxyapatites
Thermochimica Acta, 1994Abstract Calcium—cadmium hydroxyapatite solid solutions with the general formula Ca 10- x Cd x (PO 4 ) 6 (OH) 2 were prepared by a double decomposition method. The samples were characterized by X-ray diffraction, infrared spectroscopy and elemental analysis.
A.Ben Cherifa +3 more
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2018
Abstract Definition and mathematics of enthalpy. Definition of heat capacity at constant pressure as CP = (∂H/∂T)V. Endothermic and exothermic reactions. Role of the change in enthalpy as regards the direction and spontaneity of a change in state. Enthalpy changes and phase changes. Measuring enthalpy changes by calorimetry.
Dennis Sherwood, Paul Dalby
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Abstract Definition and mathematics of enthalpy. Definition of heat capacity at constant pressure as CP = (∂H/∂T)V. Endothermic and exothermic reactions. Role of the change in enthalpy as regards the direction and spontaneity of a change in state. Enthalpy changes and phase changes. Measuring enthalpy changes by calorimetry.
Dennis Sherwood, Paul Dalby
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A-to-Z Guide to Thermodynamics, Heat and Mass Transfer, and Fluids Engineering, 2006
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