A solution contains 50.0 g of heptane (C7H16) and 50.0 g of octane (C8H18) at 25 °C. The vapor pressures of pure heptane and pure octane at 25 °C are 45.8 torr and 10.9 torr, respectively. Assuming ideal behavior, answer the following: d. Why is the composition of the vapor different from the composition of the solution?

Video transcript

Hi everyone today, we have a question asking us to consider an ideal solution at 25 degrees Celsius. That is made up of 35.0 g of plantain C five H 12 and 35.0 g of hexane C six H 14. The vapor pressure plantain and hexane at 25 degrees Celsius are Tour And 153 toy, respectively. And our goal here is to figure out why is the composition of the solution different from the composition of the vapor phase? So painting and heck scene are both volatile compounds. Plantain and hexen have different volatilities so the solution will have a different composition as the vapor phase. And that is our answer. Thank you for watching. Bye.