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Stoichiometric coefficients are simply the numbers multiplying chemical formulas in a chemical equation, and I don't believe that they are measured in moles. These coefficients show how many formula units or molecules are present (how many NaCl molecules there are for example). They're used to balance chemical equations by multiplying each coefficient to achieve a whole number, while maintaining the same ratio.
Stoichiometric coefficients do not have units associated with them, but rather they show how many atoms, molecules, or formula units are present in a substance. Subsequently, you can multiply these values by 6.0221 x 10^23 (or 1 mol) as a mole could represent any of these, which gives rise to the concept that the stoichiometric coefficients in a chemical equation show the number of moles of each substance on either the reactants or products side and their ratios.
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