Mass of Substance = Volume of Substance x Density of Substance
Density of isopropyl alcohol = 785.4 kg/m3
Density of isopropyl alcohol in tonne/cup(US) = 1731.5085479999998
Mass of a Substance = 1731.5085479999998 x 13
13 cup(US) of isopropyl alcohol weighs 22509.611123999995 tonne