They cannot be and the question, as stated, cannot be answered sensibly. A micron is a measure of distance, with dimensions [L]. A gram is a measure of mass, with dimensions [M]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
The question is like asking how many pounds is your drive to work.
Hectograms can't be converted to microns since they are not compatible to each other. Hectograms deals with mass while microns deals with length.Hence, there is no way to determine 30 hg in microns.
4.4 what? Microns? Light years? miles?
2 kilograms converted to grams is 2000.
0.0639 grams
milliliters cant be converted into grams
0.0280 grams?
500,000 grams
3 grams
5.67 grams
39462.49 grams
200000grams
348,000 grams