Select the correct answer. A substance is followed by the symbol (l) in a chemical equation. What does the symbol represent?

A.
The substance has the least molecules in the equation.
B.
The substance is in the liquid state.
C.
The substance is produced last in the reaction.
D.
The substance is dissolved in a liquid solution.
E.
The substance is lost at the end of the reaction.

The boiling point of liquids is very high what does it indicate

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

)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.