There are 1000 grams in one kilogram. Therefore, 0.5 grams is equal to 0.5 x 1000 = 500 grams.
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The question, as stated, cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A gram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider a millilitre of air and a millilitre of water. They will have very different masses.
Grams are a measure of mass and mL are a measure of volume. 0.5 mL equals 0.0169 ounces, though.
50 grams of water is 50 ml
for other materials you need to know their density in g/ml