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Density is calculated by dividing the mass of the object by its volume.
Density = mass / volume
Density = 3.00 x 10^2 g / 86.2 mL
Density = 3.00 g / 0.0862 L (since 1 mL = 0.001 L)
Density = 34.83 g/L
Since the volume is given to three significant figures, and the mass is given to two significant figures, the final answer should have two significant figures.
Therefore, the density of the object is 35 g/L.