# MEGAN output unit conversion: from mol/s to g/s

**URL:** <https://forum.cmascenter.org/t/megan-output-unit-conversion-from-mol-s-to-g-s/5886>\
**Category:** MEGAN\
**Created:** [July 2, 2025, 9:32am UTC](https://forum.cmascenter.org/t/megan-output-unit-conversion-from-mol-s-to-g-s/5886 "2025-07-02T09:32:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tingting1](https://avatars.discourse-cdn.com/v4/letter/t/5fc32e/32.png) [@tingting1](https://forum.cmascenter.org/u/tingting1)\
**Post date:** [July 2, 2025, 9:32am UTC](https://forum.cmascenter.org/t/megan-output-unit-conversion-from-mol-s-to-g-s/5886/1 "2025-07-02T09:32:30Z")

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Hi,  
Can the compound units output by megan based on the CB05 mechanism be converted from mol/s to g/s using the relative molecular mass recommended by Specdb for the CB05 mechanism, or should a different relative molecular mass be used? I am very sorry, but since new users cannot upload attachments, I can only post a segment of the CB05 mechanism compound and its relative molecular mass for your reference.The first column is the compound name, the second is the number of carbon atoms, and the third is the relative molecular mass.  
PAR 1 16.00  
OLE 2 32.00  
TOL 7 112.00  
ISOP 5 80.00  
Thanks,  
Tingting

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**Author:** ![willison.jeff](https://avatars.discourse-cdn.com/v4/letter/w/c89c15/32.png) [@willison.jeff](https://forum.cmascenter.org/u/willison.jeff)\
**Post date:** [July 23, 2025, 2:04pm UTC](https://forum.cmascenter.org/t/megan-output-unit-conversion-from-mol-s-to-g-s/5886/2 "2025-07-23T14:04:57Z")

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The MGN2MECH program uses the weights in SPC\_CB05.EXT to convert from mol/s to ton/hr.

You could change those values when running the program or do the calculation with an external script.