The heat of fusion DeltaHf of ethyl acetate (C4H8O2) is 10.5 kJ/mol. Calculate the change in entropy DeltaS when 43. g of ethyl acetate freezes at - 84.0 °C. Be sure your answer contains a unit symbol. Round your answer to 2 significant digits.

)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.

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules