The s−s bond distances in s8 are 204 pm and the f−f bond distance in f2 is 143 pm. use these values to estimate the s−f bond distance in s2f2.

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Why did southern business leaders want to increase the number of slaves

)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.