Acetonitrile has a density of 0.786 g/mL. Calculate the mass of 4.50 mL of Acetonitrile. Give your answer to the correct number of significant figures.

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

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answer; i believe that the correct answer is (a) potassium(k)