How big would the cube have to be?
What size does a cube made of tungsten have to be so that it weighs exactly 1 kilo?
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To do this, you need the density of tungsten, Ļ=19.28 g/cm3.
The density is mass per volume, Ļ=m/V, and the volume of a cube is the critical potency of the edge length, V=a3. If this is used, Ļ=m/V=m/a3 and a=3ā(m/Ļ)=3.7 cm are obtained.
3,7280428631 cm Edge length
For this, you need the density of tungsten, then you can calculate it.