What is the mass of an object, when the volume of it is 50.0 mL and the density is 1.5
g/mL?

Answer:
75 g
Explanation:
Mass=Density x Volume so therefore you do the density which is 1.5 g/mL times the volume which is 50.0 mL so you get 75 g because the mL cancel out in the label!