I need help with chem. Can you put the working below, please?

1) A student measures the mass of an 8 cm³ block of brown sugar to be 12.9 g. What is
the density of the brown sugar?
2) A chef fills a 50 mL container with 43.5 g of cooking oil. What is the density of the oil?
3) Calculate the mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL.
4) Calculate the volume of a liquid with a density of 5.45 g/mL and a mass of 65 g.
5) A piece of PVC plumbing pipe displaces 60 mL when placed into a container of water. If
the pipe has a mass of 78 g, what is the density of PVC?
6) 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 graduated
cylinder, the water level rises to 75 mL and the total mass is now 250 g. What is the
density of the rock?
7) Using the density chart below, make up a scenario that shows you understand Density
and its relationship. The Density of water is 1g/cm³
Solids
Marble=2.56g/cm3
Quartz=2.64g/cm3
Diamond=3.52g/cm3
Table of Densities
Density g/cm³
Solids
Copper=8.92g/cm3
Gold=19.32g/cm3
Platinum=21.4g/cm3
Density g/cm³
Example: In a container of water, Marble will sink because it has a density greater than 1g/cm³
(don't use this example).