Chem homework, please help!

Question

A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is  The liquid solvent has a mass of  and a density of  Determine the mass of the solid given its density is 

Answer 1

V= 80.0 ml

M= 38.7 g

D= .0865g/ml

M= ??

D= 2.75 g/ml

The first step is to figure out the volume of the the liquid. Since we are given a mass and a density, we can figure it out using: D=m/v m=DxV V=m/D

V= 38.7g/0.865 g/ml = 40.74 ml Volume of the liquid

We can now use this number to determine the volume of the solid

Volume of solid+liquid - volume of the liquid

80.0 ml -40.74 ml = 39.26 ml volume of the liquid

To to determine the mass of the solid, we can use the density of the mass we were given and the volume of the solid we found.

m = D x V

2.75 g/ml x 39.26 ml = 108 grams