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1 percent is equal to 1g/100ml. Therefore 1 percent is equal to 10grams/Liter 1 percent is equal to 1g/100ml. Therefore 1 percent is equal to 10grams/Liter
Divide by ten. e.g. 200 mg/L = 20%
(Micrograms per litre)/(gram molecular weight of solute) = (micromoles per litre).
Gases normally have a density of a few grams per liter (i.e., per cubic decimeter), at most. Air, for example, has a density of about 1.2 grams per liter, at standard temperature and pressure. The standard SI unit for density would be kilogram per cubic meter (which actually happens to be equivalent to grams per liter!), but many people are still accustomed to specify the density per liter, not per cubic meter.
40 per cent of 200.