4. A mass of mercury occupies 0.750 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g / ml and the density of ethanol is 0.789 g / ml. 

a. 0.0437 L 

b.0.0777L 

c. 12.9L 

d. 22.9L

5.  When two materials have different densities like water and oil, they find 

a. they exchange densities 

b. they will mix uniformly 

b. they repel each other 

c. they separate according to their densities