[Titration_Man]

I'm looking to confirm if whether or not this conversion is correct. I found this conversion from E1% to ε from this site here https://www.chemeurope.com/en/encyclopedia/Molar_absorptivity.html and it's the only reference I've been able to find. It states the ε units are L mol-1cm-1, while E1% L g-1cm-1. It would make sense then if you know your E1% and molar mass of your analyte, to simply multiply by X g/mol (x being the mass) to convert from E1% to ε. However, the conversion provided by the link above has ε =(E1%* molecular weight)/10. What's the point of dividing by 10?

For instance, I have the E1%,1 cm, light-absorption maximum, value for retinol listed as 1832 (325 nm) which I found in the Specification and Criteria for Biochemical Compounds: Third Edition, Page 78 - which I got for free here: https://www.nap.edu/read/21491/chapter/4#78 Retinol's MW is 286.45 g/mol. Therefore ε = (1832 L g-1cm-1 * 286.45 g mol-1) = 524,776.4 L mol-1cm-1. Again, why divide the equation by 10 as listed above?

[Borek]

Without even trying to dig into units/numbers you have listed, 10 suggests combination of 1000 (like mL in L) and 100 (like in %). Perhaps this is a combined conversion factor?

[mjc123]

Because a 1% solution is 10 g/L.