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I have a question about electrolytes. What do the numbers in front of the electrolytes mixtures mean?

For example, let's say we have:

1EC:1DEC or 3EC:7EMC or 3EC:7EMC:1DMC

Is that the volume fraction? If, I have for example 100 grams of 3EC:7EMC, would this mean 30 grams of EC and 70 of EMC? Moreover, sometimes there is a capital M in front, such as 1M or 1.2M, what does this number mean? Can anyone please explain this?

Thank you in advance!

P.S. Can anyone recommend me some literature for this? Something that covers the basics of electrolytes and electrochemistry

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# Electrolyte Notation

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