What is the mass of a 10.0 cm cubed cube of copper? i know that (g/cm cubed)= copper = 8.96 but I'm not sure how to tackle this problem. also.... If I have 51.5 g of a 50.0 cm cubed volume of one of these substances, which would it be? Alumininum 2.70 mass density, Copper 8.96, Iron 7.87, Lead 11.4, Water 1.00, Seawater 1.03, Mercury 13.6, Gasoline 0.680....How do I determine which one it is? A cubic tank holds 1,000.0 kg of water. What are the dimensions of the tank in meters? Whats the reasoning? Thanks so much!