Mass of Substance = Volume of Substance x Density of Substance
Density of n propyl alcohol = 803.7 kg/m3
Density of n propyl alcohol in pound/ounce(US) = 0.00019288830862129383
Mass of a Substance = 0.00019288830862129383 x 12
12 ounce(US) of n propyl alcohol weighs 0.0023146597034555258 pound