This graph shows how the vapor pressure of three liquids varies withtemperature:900800700600500400300 I- tetrahydrofuran200benzene100- trichloroethylene0.5060temperature, °CUse the graph to answer the following questions:Which liquid is the most volatile?most volatile:choose oneWhich is the least volatile?least volatile:choose onetetrahydrofuran:What is the normal boiling point of each liquid?Note: your answer must be within 1°C of the exactbenzene:answer to be graded correct.trichloroethylene: I °CSuppose a beaker of benzene is put inside a sealedO moretank containing benzene gas at 56. degree C and778. torr. After ten minutes, will there be more liquidin the beaker, less liquid, or the same amount?O lessO the samevapor pressure, torr

Vapour pressure is defined as the pressure exerted by a vapour on the walls of closed container by vaporized portion of a liquid. Volatility is tendency of a substance to vaporize. Vapour pressure of a substance is a pressure at which its vapour phase is in equilibrium with its liquid or solid phase. Higher is vapour pressure higher is volatility of liquid and lower boiling point. Here tetrahydrofuran has highest vapour pressure and trichloroethylene has lowest vapour pressure. So, trichloroethylene is most volatile and trichloroethylene is least volatile. most volatile = tetrahydrofuran Least volatile = trichloroethylene We have given vapour pressure in Torr. 1 atm = 760 torr So, Normal boiling point is 1 atm i.e. 760 torr. Now we will find normal boiling point of liquids using graph. We will draw a line from 760 torr and then see at what temperature this line touches to graph. That temperature is boiling point of liquid. Boiling points - Tetrahydrofuran = 65°C Benzene = 80°C Trichloroethylene = 87°C A sealed tank contains benzene gas at 56°C. And the pressure is 778 torr. We will draw a line from 56°C temperature on graph line of benzene to know pressure at that temperature. When we draw the line we get vapour pressure approx at 340 torr. But that tank has pressure of 778 torr. As the pressure is higher than vapour pressure there will be more liquid in beaker after 10 minutes. There will be more liquid in beaker after 10 minutes.