You cannot.
Milligram (not miligram) and kilogram are measures of mass whereas a litre is a measure of volume. So mg per kg is a pure ratio - with no units whereas the second is a measure of density with units of mg per litre. You cannot convert from one to the other without additional information.
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31.1 (milligrams per liter) = about 1.817 grains per US gallon.
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.
In order to convert a microliter per liter to a mililiter per liter, just divide by 1,000.
There are 1,000 milligrams per gram. 0.2 grams*(1000 milligrams/gram) = 200 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.