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    in a chemical equation what do the large numbers represent e.g. 2H or 3P. does this mean there's 2 moles of hydrogen and 3 moles of phosphorous?
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    It would mean that 2 mol of something might react with 3 mol of something else.

    It doesn't tell you how much you actually have, that would depend on the mass/volume etc.

    C + O2 -> CO2.

    1 mol of C will react with 1 mol of O2, but unless you actually have 12 g of C...
 
 
 
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