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density=mass/volume

1mL=1cm^3, so 30.0 mL=30.0 cm^3

then you divided the volume 30.0 by the mass 81.0 grams is euqal to 81.0 grams/30.0 cm^3=2.7 g/cm^3(that's the units)

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14y ago
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13y ago

2700 kg * m-3 (kilograms per cubic meter) or 2.7 grams per cubic centimeter. See related link.

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14y ago

37 square days

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Q: What is the mass of 30ml of aluminum?
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The density of a solution is calculated by dividing the mass of the solution by its volume. To determine which solution is denser, we need to compare their densities. The density of the 30ml solution is 1.5 g/ml (45g/30ml) while the density of the 40ml solution is 1.25 g/ml (50g/40ml). Therefore, the 30ml solution with a mass of 45g is denser than the 40ml solution with a mass of 50g.


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