0.5 g
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500mg = 0.5 grams
1000 milligrams = 1 gram so 500*1000 mg = 500*1000/1000 grams = 500 grams.
There are 1000 milligrams in a gram. Therefore 500mg is 0.5 grams.
20 g
1g=1000mg When converting units, put what kind of units you want (grams) on top, and what kind of units you have (mg) on bottom. so.. 500mg x (1g) = 0.5 grams 1000mg mg will cancel leaving your units in grams.