Answers

2016-04-09T23:17:45+05:30
Volume of iron = 4/3×22/7×0.21 × 0.21 ×0.21
                         ≈ 0.039 cm³

density= mass/volume
           7.8 g/cm³ = mass/0.039 cm³
           7.8 × 0.039  = mass 
            0.3042 g = mass
            
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