Answer:
3.54 g is the mass of acetonitrile, that occupies 4.50 mL of volume
Explanation:
Density is defined as the relation that a mass of certain compound, which occupy certain volume.
The formula is → mass / volume = density.
In this case acetonitrile mass / acetonitrile volume = acetonitrile density
So, acetonitrile mass = acetonitrile volume . acetonitrile density
If we replace the data given,
acetonitrile mass = 4.50 mL . 0.786 g/mL → 3.54 g
