What is the density of a piece of wood that has a mass of 20.0 grams and a volume of 30.4cm?

To find the density of the piece of wood, use the formula: density = mass/volume. Given the mass is 20.0 grams and the volume is 30.4 cm³, the density would be 20.0 g / 30.4 cm³, which equals approximately 0.659 g/cm³. Thus, the density of the wood is about 0.659 g/cm³.