Mass of Substance = Volume of Substance x Density of Substance
Density of methyl ethyl ketone (mek) = 804.9 kg/m3
Density of methyl ethyl ketone (mek) in gram/litre = 804.9
Mass of a Substance = 804.9 x 1
1 litre of methyl ethyl ketone (mek) weighs 804.9 gram