we dont know
Density is calculated as mass divided by volume. In this case, the mass of the silicon sample is 820g and the volume of the container is 350 cm^3. Therefore, the density of the silicon sample in the container is 820g / 350 cm^3 = 2.34 g/cm^3.
1.0 cu cm. = 1.0 mL 1.0 cu m = 1000 L = 1 x10^6 cu cm