If the mass of a solid metal is 4kg and the volume is 0.51dm3, the metal block is made of () A. Copper B. aluminum C. iron D. lead

The density of the metal block is ρ = MV = 4kg0.51 × 10 − 3m3 ≈ 7.8 × 103kg / m3. Looking up the density table, we can see that the density of the metal block is close to that of iron. The metal block used is made of iron. So we choose C

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