Density = Mass/Volume
Volume of cube=5cmx5cmx5cm=125cm3
So 30g/125cm3=0.24g/cm3
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A cube with a side length of 5 cm has a volume of 125 cubic cm
125 cm3
0.8 gm per cm3
The surface area is 750 cm^3
Volume = length * width * height = 10cm * 5cm * 2 cm = 100 cm3 Density = mass/volume = 300g/100cm3 = 3 grams per cm3.