a graduated cylinder has a mass of 50 g when empty. when 30 mL of water is added, the graduated cylinder has a mass of 120 g. if a rock is added to the grand cylinder, the water level rises to 75 mL and the total mass is now 250 g. what is the density of the rock?

The answer to your question is:

a) The gold cube is larger.

b) lenght = 1.67 cm

Explanation:

Data

Platinum density 21.45 g/cm3 100 gram cube

Gold density 19.3 g/cm3 100 gram cube

Formula

density = mass / volume

a) Calculate volume

volume = mass / density

Platinum volume = 100 / 21.45 = 4.66 cm3

Gold volume = 100 / 19.3 = 5.18 cm3

b) Volume = lenght³

4.66 cm³ = lenght³

lenght = ∛4.66

lenght = 1.67 cm