Mass is measured by density multiplied by volume. In order to figure out a mass of a rock, one must know its density and its volume measurements.
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The volume of the rock is the amount of water it displaces, 250ml. Considering that 1ml of water has a mass of 1 mg, the mass of the rock is 5.63 x 250gm = 1,407.5mg.
Determine its volume by how much water it displaces, then divide mass by volume
density = mass/volume = 250g/45cm3 = 5.6g/cm3 (rounded to 2 sig figs)
You need the mass and volume to calculate the density
if the rock is as you say then you could turn it into 3cm cubed and a mass of 30 grams. that means that it is 1cm cubed and a mass of 10 grams, so that means the density is 10 g/cc,while water's is 1 g/cc , finally the rock is ten times heavier then the water.