The same: there are 1000 micrograms/milligram and 1000 milligrams/gram! Why should you want to convert that way? There are:
1,000 mcg in 1 mg
1 million mcg in 1g
1,000 mg in 1g
1,000,000,000 mcg in 1Kg
1 million mg in 1 Kg
1,000g in 1 Kg
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There are 1,000 milligrams per gram. 0.2 grams*(1000 milligrams/gram) = 200 milligrams
You cannot. The problem here is you have weight per area and you want to convert to weight per volume. You need a third dimension to the area to calculate this.
(Micrograms per litre)/(gram molecular weight of solute) = (micromoles per litre).
30 per cent of 100 grams is 30 grams which is 30 000 milligrams.
You have to know the concentration first. That will either be in grams per milliliter (or milligrams per milliliter), or it could be in moles per liter (molarity). If it's given in grams per milliliter, just multiply that number by 60 and multiply by 1000.If it's given in moles per liter, than first find how many moles in 60 mL by multiplying by 0.06, and then convert moles to grams using the molar mass of caffeine (194.19 grams per mole).See the Related Questions for how to convert moles to grams.