J.R. S. answered 01/20/21
Ph.D. University Professor with 10+ years Tutoring Experience
Density is given as mass/volume
So, we need to know the mass and the volume and then we can calculate density.
mass = 1.2 g (I'll assume grams since you didn't say)
volume = 3.2 cm x 17.1 cm x 4.7 cm (I'll assume cm since you didn't say) = 257 cm3
Density = 1.2 g / 257 cm3 = 0.0047 g/cm3