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Massa Mg (Magnesium) → 20 m³.
Massa jenis Air laut → 1,02 g/ml.
Jawab :
P = 1,02 g/ml → 1,02 g/cm³
= 0,00102 kg
1000000 m³
= 1,02 x 10 ^-9 kg/m³
Massa Mg dalam 20 m³ Air laut = 1,02 x 10^-9 kg/m³ x 20 m³ = 20,4 x 10^-9 kg.