Over 99% of all organisms that have ever lived on Earth are now extinct. This statement indicates which? *
O Extinction is a natural part of life on Earth
O Extinction is very rare
O'The rate of extinction has increased since humans evolved
O The earth's environment is not good at supporting life

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.