Such a substance will float on water, if that's of any help.
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500 mg is 1/2 gram. That's less than a gram.
That would depend upon the density of the oil (which will depend upon temperature), how absorbant of oil the substance was and how deep the oil is. Assuming the substance does not absorb any of the oil then depending upon the oil various things would happen: In some oils such as Car oils, Coconut oil, Crude oil California, Linseed oil which all have a density less than 0.95 g/ml the substance would sink (unless the oil was not deep enough in which case the substance would sit on the bottom of the container and appear above the surface of the oil). In other oils such as Castor oil, Crude oil Mexican, Rosin oil which all have a density greater than 0.95g/ml the substance would float.
No. 1 gram is 1,000 milligrams, which our research staff says is more than 750 .
The word is "weigh" not way! In any case, there cannot be an answer because a gram is a measure of mass, not of weight.
For the same mass, yes.