Enthalpy is a state function Enthalpy is an

  • Slides: 20
Download presentation
Enthalpy is a state function. Enthalpy is an extensive quantity. The change in enthalpy

Enthalpy is a state function. Enthalpy is an extensive quantity. The change in enthalpy is equal to the heat absorbed in a process at constant pressure if the only work done is reversible pressure-volume work.

Work done in an Isothermal Expansion/compression of an ideal gas. (a) Free expansion (b)

Work done in an Isothermal Expansion/compression of an ideal gas. (a) Free expansion (b) pex=0, w=0 (b) Expansion against constant pressure (Expansion of a gas formed in a chemical reaction) w =P 2(V 2 -V 1) © Reversible isothermal Expansion/contr

Internal Energy Change in an Isothermal Expansion/compression of an ideal Gas

Internal Energy Change in an Isothermal Expansion/compression of an ideal Gas

Thermodynamics changes in an adiabatic process of an ideal gas.

Thermodynamics changes in an adiabatic process of an ideal gas.

Thermodynamic changes for a real gas (a) Free expansion (b) pex=0, w=0 (b) Expansion

Thermodynamic changes for a real gas (a) Free expansion (b) pex=0, w=0 (b) Expansion against constant pressure w =P 2(V 2 -V 1) © Reversible isothermal Expansion/contr

Internal energy change in an isothermal process for a real gas.

Internal energy change in an isothermal process for a real gas.

Unfamiliar Quantities that can be recognized, interpreted, or measured.

Unfamiliar Quantities that can be recognized, interpreted, or measured.

Change of volume with temperature. EXPANSION COEFFICIENT ( ) Thermal expansion is also used

Change of volume with temperature. EXPANSION COEFFICIENT ( ) Thermal expansion is also used in mechanical applications to fit parts over one another. There exist some alloys with a very small CTE, used in applications that demand very small changes in physical dimension over a range of temperatures. One of these is invar 36, with a coefficient in the 0. 0000016 range. These alloys are useful in aerospace applications where wide temperature swings may occur.

Change of volume with Pressure ISOTHERMAL COMPRESSIBILITY ( T) Oxygen compresses more than helium.

Change of volume with Pressure ISOTHERMAL COMPRESSIBILITY ( T) Oxygen compresses more than helium. Therefore, if two cylinders with the same internal volume are filled to the same pressure, one with oxygen and the other with helium, the oxygen cylinder will hold more cubic feet of gas than the helium cylinder. Change of pressure with Temperature

Change of internal energy with Volume Test of a state Function (e. g. p=f(V,

Change of internal energy with Volume Test of a state Function (e. g. p=f(V, T)

Internal energy change in an isothermal process for a real gas.

Internal energy change in an isothermal process for a real gas.

Internal energy change in an adiabatic process for a real gas.

Internal energy change in an adiabatic process for a real gas.

Enthalpy changes in a thermodynamic Processes.

Enthalpy changes in a thermodynamic Processes.

Changes in Internal energy with temperature at constant pressure

Changes in Internal energy with temperature at constant pressure

Changes in enthalpy with temperature at constant volume.

Changes in enthalpy with temperature at constant volume.

Relation between Cp and CV

Relation between Cp and CV

ENTHALPY CHANGES ENTHALPY CHANGES CONTENTS Thermodynamics Enthalpy changesENTHALPY CHANGES ENTHALPY CHANGES CONTENTS Thermodynamics Enthalpy changes
BOND ENTHALPY Bond Enthalpy The enthalpy associated withBOND ENTHALPY Bond Enthalpy The enthalpy associated with
Enthalpy Enthalpy Enthalpy His the total amount ofEnthalpy Enthalpy Enthalpy His the total amount of
Enthalpy ENTHALPY CHANGES ENTHALPY H the energy contentEnthalpy ENTHALPY CHANGES ENTHALPY H the energy content
Enthalpy Ch 5 Enthalpy If a process takesEnthalpy Ch 5 Enthalpy If a process takes
H is called the enthalpy The enthalpy changeH is called the enthalpy The enthalpy change
Thermodynamics 1 2 1 Enthalpy 2 1 EnthalpyThermodynamics 1 2 1 Enthalpy 2 1 Enthalpy
CALORIMETRY ENTHALPY CHANGES be able to define enthalpyCALORIMETRY ENTHALPY CHANGES be able to define enthalpy
Enthalpy Wheel Introduction Enthalpy wheels are starting toEnthalpy Wheel Introduction Enthalpy wheels are starting to
STANDARD MOLAR ENTHALPY OF FORMATION Enthalpy change whenSTANDARD MOLAR ENTHALPY OF FORMATION Enthalpy change when
ENTHALPY CHANGES ENTHALPY A guide for A levelENTHALPY CHANGES ENTHALPY A guide for A level
Chemistry Energy Revision Contents Enthalpy First Law EnthalpyChemistry Energy Revision Contents Enthalpy First Law Enthalpy
Enthalpy Calculations And the specific heat equation EnthalpyEnthalpy Calculations And the specific heat equation Enthalpy
THERMOCHEMISTRY Day 4 Enthalpy and Heating Curves ENTHALPYTHERMOCHEMISTRY Day 4 Enthalpy and Heating Curves ENTHALPY
CHEM 3310 Thermodynamics Change in Enthalpy H EnthalpyCHEM 3310 Thermodynamics Change in Enthalpy H Enthalpy
Sensible Heat and Enthalpy Calculations constant A EnthalpySensible Heat and Enthalpy Calculations constant A Enthalpy
Bond Enthalpy Chem 12 The enthalpy change requiredBond Enthalpy Chem 12 The enthalpy change required
Endothermic Exothermic Reactions Enthalpy H Heat Enthalpy ChangeEndothermic Exothermic Reactions Enthalpy H Heat Enthalpy Change
Hess Law and enthalpy cycles using enthalpy ofHess Law and enthalpy cycles using enthalpy of