Question

A chemist prepares a mixture of hexane and toluene at a temperature of 27.0 °C. He measures out 5.17 mL of hexane and mixes it with 73.6 mL of toluene. t measures the volume of the solution after it is well mixed and finds that it is 82.7 mL. The density of hexane is 0.66 g/mL and the density of toluene is 0.87 g/ml.
Calculate the volume percent of hexane in this solution.
Be sure your answer has the right number of significant digits

Answer 1

To calculate the volume percent of hexane in the solution, we first need to determine the total mass of the solution.

First, we calculate the mass of hexane:
mass of hexane = volume of hexane * density of hexane
mass of hexane = 5.17 mL * 0.66 g/mL
mass of hexane = 3.41 g

Next, we calculate the mass of toluene:
mass of toluene = volume of toluene * density of toluene
mass of toluene = 73.6 mL * 0.87 g/mL
mass of toluene = 63.832 g

Now, we calculate the total mass of the solution:
total mass = mass of hexane + mass of toluene
total mass = 3.41 g + 63.832 g
total mass = 67.242 g

Next, we calculate the volume percent of hexane:
volume percent of hexane = (mass of hexane / total mass) * 100%
volume percent of hexane = (3.41 g / 67.242 g) * 100%
volume percent of hexane = 5.07%

Therefore, the volume percent of hexane in this solution is 5.07%.