There is no volume that has units of length. If you meant to write 8cm3 then the cube has all edges 2cm (ie the "cube root" of 8 times the "cube root" of cm3)
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Each side is 8cm.
Density = mass/volume = 4g/8cm3 = 0.5g/cm3
Volume = e3 where e is the edge length. So, 83 = 512 cubic cm
V = 226.195 cm3
If a face on a cube is 49 square meters the cube's volume is: 343 m3