Chapter 5C

##### 5C. Conversion between mole, volume and weight percent Back to Main

Analyses are given normally in mole percent, but it is sometimes necessary to convert from one type to another. This page will perform conversions between mole, volume, and weight percent. Please refer to pages 133-134 in Gas Conditioning and Processing Volume 1 for more details.

How do I carry out this calculation?

To perform a conversion, select Type of analysis by clicking on and shading the circle provided for the chosen conversion. If Mole % is selected then the mole % of each component will need to be entered into the component table. If Weight % is selected then the weight % of each component will need to be entered into the component table. If Liquid volume % is selected then the volume % of each component will need to be entered into the component table.

The component table is a list of the possible compounds along with their formulas to be used with this program. In the far right column titled Mole %, Weight % or Volume % use the mouse to choose the available cell and enter the percentage of the component in the mixture. Use the Up and Down arrow keys to move from cell to cell. The total percent should be 100.00.

C6+ contains all components with molecular weight greater than Pentane and is characterized by its molecular weight and relative density. If the mixture contains components with a molecular weight greater than Pentane select "Is C6+ present" by clicking on and adding a checkmark to the box provided. Once this is done the entry spaces for the molecular weight and the specific gravity (relative density) will appear.

Once the Type of analysis has been selected, the component table completed and the molecular weight and specific gravity of any C6+ present has been entered, select Run to execute the solution.

##### Definitions of the variables and where to obtain the unknown data

Molecular weight is the mass of the collection of atoms represented by the chemical formula for a molecule.

C6+Specific gravity is the relative density of C6+ fraction.

Liquid relative density is density of a liquid divided by the density of pure water at 15° C [60° F]. Volume 1, Page 17 and 60

C6+ contains all components with molecular weight greater than Pentane and is characterized by its molecular weight and relative density.

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