Density is mass per unit volume. Since there is no information on the volume of the object, the question cannot be answered.
Furthermore, mass is only indirectly related to weight. Weight is the force experienced by a mass under the influence of a gravitational force. However, while the mass of a body remains constant, its weight will depend on the gravitational force acting upon it. On the moon, for example, a body will weigh only a sixth as much as it does on earth. So you cannot use weight in calculating density.
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A kilometre is a measure of length whereas a gram is a measure of weight. Converting kilometres into grams cannot be done.
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass while milliliters (mL or ml) measure volume.
The density is (32)/(the length of each edge of the cube)3
density = mass/volume mass= 425g volume=length*width*height = 1.6cm*2.5cm*8.0cm = 32 cm3 density = 425g / 32cm3 density = 13.28125 g/cm3
Density = (mass)/(volume) = 128/4 = 32 gm per ccNote: That's a remarkable substance you've got there. It's about 2.8 times as dense as lead,and about 42% denser than osmium ... the heaviest natural element. Don't drop it.