2 mg per 1 ml is more concentrated but that means that you will need a bigger quantity of the 0.2 mg per 1 ml mixture for the same amount of the active ingredient.
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that depends on the liquid in water it would be (5ng)/mg because 1ml=1mg for water
It is not possible to answer this without knowing the density of the active ingredient per ml. I.e some drugs may be 1000mg per ml, whereas others could be 2mg per ml. There is no standard "amount per ml" for all liquid medicines etc...
You have 1ml. Molar means 1 mole per litre. So if you have 1 mole in a litre, you have 0.001 moles in 0.001 litres. 0.001 moles is 1 millimole.
The third one.
lets see... 10k mcg= 10 mg 10mg = .01g 1ml would be needed.