Billy M. answered 12/08/21
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The volume of a cube is given by s^3.
the volume of this cube is 4.5cm x 2cm x3.4 cm = 30.6 cm^3.
density = mass/volume
12.3 g/cm^3 =mass / 30.6 cm^3
mass = 12.3 g/cm^3 x 30.6 cm^3
mass =376.38 g
approximately 376.4 g