Standard Enthalpy Formation Value Gibbs Free Energy Entropy Heat Capacity Organic

Overview

Engineering reference data for Standard Enthalpy Formation Value Gibbs Free Energy Entropy Heat Capacity Organic in thermodynamics.

Key Formulas

First Law

$\Delta U = Q - W$

Energy is conserved — heat added minus work done.

Ideal Gas Law

$PV = nRT$

Relates pressure, volume, and temperature of an ideal gas.

Heat Transfer

$Q = mc\Delta T$

Sensible heat transfer.

Carnot Efficiency

$\eta = 1 - T_C/T_H$

Maximum efficiency between two temperatures.

Variables

Symbol	Description	Unit
$U$	Internal energy	J
$Q$	Heat	J
$W$	Work	J
$P$	Pressure	Pa
$V$	Volume	m³
$T$	Temperature	K

Thermodynamic Property Definitions

Standard thermodynamic values for organic substances are typically referenced at 25°C (298.15 K) and 1 bar. The key properties are:

• ΔH°f (Standard Enthalpy of Formation): The heat change when 1 mole of a compound is formed from its elements in their standard states.
• ΔG°f (Standard Gibbs Free Energy of Formation): The maximum non-expansion work obtainable from the formation of 1 mole of a compound from its elements in their standard states.
• S° (Standard Molar Entropy): A measure of the molecular disorder or randomness of 1 mole of a substance at standard conditions.
• Cp (Standard Molar Heat Capacity at Constant Pressure): The amount of heat required to raise the temperature of 1 mole of a substance by 1°C at constant pressure.

Organic Compounds Data

References

• Original Source