How many mols of hexane are there in 5 mL if the density, d, of hexane is 0.655 g/mL and the molecular weight is 86.18 g/mol?

Question

How many mols of hexane are there in 5 mL if the density, d, of hexane is 0.655 g/mL and the molecular weight is 86.18 g/mol?

Answer 1

Hello Nelson

 

First use the volume and density of hexane to calculate its mass.

 

d = m / V

 

m = d x V

 

    = 0.655 g/mL x 5 mL

 

    = 3.28 g

 

Divide mass of hexane by its molecular weight to determine the # of moles. 

 

3.28 g x (1 mol / 86.18 g) = 0.0381 mol hexane