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r = 1.5 cm / 2 = 0.75 cm
v = 4/3 · π · r³
v = 4/3 · π · (0.75 cm)³
v = 4/3 · π · 0.422 cm³
v = 4/3 ·(3,14) · 0.422 cm³
v = 1.767 cm3
D = m/v
D = 150 g / 1.767 cm3
D = 84.89 g/cm3
d = 84.89 g/cm³ = 84.89 Kg/L