Different substances have different densities. If you're talking about water, then 1 liter masses 1 kilogram, so 16 liters.
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That depends on what the 16 liters of space are full of.If it's air, then very few kilograms. Probably less than 1.If it's water, then 16 kilograms.If it's lead, stone, or gold, then a lot more than 16 kilograms.If the 16 liters of space are empty, then there are zero kilograms of mass in it.
3.6
7pi liters
Depends on the density of the substance in question.
16 US gallons = 60 liters 16 UK gallons = 72 liters