Chapter 8B

8B. Hydrocarbon Vapor Enthalpy using the charts in Appendix 8A Back to Main

This page it used to determine hydrocarbon vapor enthalpy using the charts Temperature Vs Molecular Weight at a particular pressure. Values are plotted for gas molecular weights from 16 - 30. This is considered the practical range for this type of correlation. Pressures of 100 kPa - 14.0 Mpa [152,000 psia] are plotted. To find a gas enthalpy at a pressure between those shown, simply use arithmetic interpolation.

Enthalpy is a quantity defined by the relationship H = E + PV. The enthalpy change, DH, for a reaction that occurs at constant pressure in the heat evolved or absorbed in the reaction.

To carry out the enthalpy calculation the Temperature, Pressure and Molecular Weight of the Vapor must be entered into the entry space. To do so use the mouse to click the courser in the entry space and input the data.

Once Temperature, Pressure and Molecular Weight of the vapor has been entered, select Run to execute the solution.

To convert unit values of data, please refer to “Set Auto Convert and Unit Conversion” in the main page.

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