What is the density of the mixture?

Question

The mass of a 50-mL volumetric flask is 40.638 g. After adding 15.0 mL of 95% ethanol and filling to the calibration mark with water, the flask weighed 88.219 g. What is the density of the mixture?

Answer 1

Density = Mass / Volume

 

           = (88.219 - 40.638) g / 15.0 ml = 3.172066666...  =  3.17206