First you weigh it, then you put it in a beaker with a known amount ow water in it. By noting how much the volume of water increases you get the volume of the magnetite. Now you got all you need to determine the density.
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calculate density of sponge ?
The density of a piece of granite with a volume of 340 cm and mass of 918 g would be 1,400 grams. This is a math problem.
The volume of the piece of wood is (10 x 5 x 3) = 150 cubic cm. In order to find its density, you also have to know its mass. When you have that, divide it by 150 cm3, and the answer is the density.
It depends of the piece of wood itself and the type of wood that it is.
The density of this piece of wood would be 456.7 g/cm^3.