What are they?
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That's impossible to measure (and not least because many human cells are different from eachother). There are at probably hundreds of thousands or more in a single cell. And there are also at least tens of thousands of different types of molecule so it's hard to know where to start!
Generally cells contain proteins and amino acids, carbohydrates and sugars, lipids, nucleic acids, steroids, etc., and combinations of all of them joined together.
Generally cells contain proteins and amino acids, carbohydrates and sugars, lipids, nucleic acids, steroids, etc., and combinations of all of them joined together.