J.R. S. answered 09/20/17
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
If you assume the average density of oak is 0.75 g/cm3 and that the volume of your cube is 8 cm3 (not 8 cm), then
mass = 0.75 g/cm3 x 8 cm3 = 6 grams