Question understanding chemistry texts that don't use weights/numbers

mycelium

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High, everyone

Here is an example...

The initial setup of the experiment was as follows: 4-aminophenol was suspended in dichloromethane and treated with various excesses of acetic anhydride and catalytic pyridine to provide 4-acetamidophenyl acetate

Oftentimes, chemistry texts that aren't real for cooks but for actual chemists, do not use amounts of anything, like "react this with that" or the above example, "treated with various excesses of AA and catalytic pyradine.."
Is this based on molar amounts, like it you have 1.5 g of the 4aminophenol, then whatever that mol weight is, you would apply that to the others(an excess, would that be a molar excess)
Or, it because chemists already know that when you have certain chemicals you always react them in certain ways?
I have a slight learning disability and never had chemistry, so I'm trying to learn...I have a tek somewhere that shows how to synthesize acetaminophen from 4aminophenol, but I was just wondering in general.
Thank you
 
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