What is the density of carbon dioxide gas if 0.196 g occupies a volume of 100 mL?

1. What is the density of carbon dioxide gas if 0.196 g occupies a volume of 100 mL?
2. A block of wood that measures 3.0 cm on each side has a mass of 27 g. What is the density of the block?
3. An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 20 mL. The height of the water rose to 7.0 mL. If the mass of the stone was 25 g, what was its density?
4. A 10.0 cm³ sample of copper has a mass of 89.6 g. What is the density of copper?
5. Silver has a density of 10.5 g/cm³, and gold has a density of 19.3 g/cm³. Which would have a greater mass, 5 cm³ of silver or 5 cm³ of gold?
6. Five mL of ethanol has a mass of 3.9 g, and 5.0 mL of benzene has a mass of 4.4 g. Which liquid is denser?
7. A sample of iron in the shape of a rectangular prism has the dimensions of 2.0 cm x 3.0 cm x 2.7 cm. If the mass of this object is 94 g, what is the density of iron?