Four.
There are 1000 milligrams per gram. If you need two grams, that will equal 2000 milligrams. Divide 2000 by 500 to get four.
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1 gram = 0.001 milligrams so 0.125 grams = 125 milligrams. So you need 125 pills.
Two and a half.
If someone told you to take 4 grams of ocycodone, then they're doing something wrong but, there are 133.333... 30mg tablets in 4g. So the answer to your question woul be, 133 and 1/3.
1 troy ounce = 31.1034768 grams
1*10^-7 grams, or 1/10 microgram