Structure of 4-ethylheptene

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

)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.