m = ρ V = 8, 96 \frac{g}{c m^{3}} \cdot 15 c m^{3} = 0, 45 g = 4, 5 \cdot 10^{- 4} k g

${m = \rho V = 8,96\, \mathrm{\frac{g}{cm^3}} \cdot 15\, \mathrm{cm^3} = 0,45\, \mathrm{g} = 4,5 \cdot 10^{–4}\, \mathrm{kg}}$

Error