An atom has the electron configuration 1s22s22p63s23p1. how many valence electrons does the atom have? valence electrons

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

)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 percentage of hydrogen in c2h4