Which of the following compounds has exactly two atoms of hydrogen? hcl ch4 hno3 h2o2

Adepositional also feature that forms where a stream enters a lake or an ocean is a

)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.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule