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You may be referring to the number of moles of that particular molecule. One mole is equal to 6.0221415x1023. That is how many atoms there are of that particular molecule or element. EG

2SO2(g) + O2(g) is in equilibruim with 2SO3(g)

the 2 in front of SO2 and SO3 indicates that there are 2 moles of that molecule. This is how we can balance equations. Moles are used to find mole ratios, molar mass as well as mass etc.

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13y ago

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