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This depends on what element/molecule you're converting.
You use the molar mass. (The sum of Atomic Mass of all the elements you're using.) Divide .00336 (since that what I'm assuming you meant) by the molar mass.
For an example of one element, it would look like this:
.00336 grams of Carbon converted to moles.
Carbon's molar mass is approximately 12.
(.00336)/ (12) = 2.8 X10-4 (or .00028) moles.
For an example of a molecule, it would look like this:
.00336 grams of Ammonium Chloride converted to moles.
Ammonium: NH4
Ammonium Chloride: NH4Cl
N's molar mass: 14
H's molar mass: 1 (but there's 4 of them, so multiply by 4): 4.
Cl's molar mass: 35.45
Add them all together: 53.45
(.00336g)/53.45 = 6.29 x 10-5 (.0000629) moles.
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