How does atomic radius change from left to right across a period in the periodic table? A. it tends to decrease B. it tends to increase C. it first increases, then decreases D. it first decreases, then increases

)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.

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?

How many moles of ccl4 are in 3.55l