22.0 mL of stock solution is used
to produce a .458 M solution after
dilution with 50.0 mL of water. What
is the molarity of the stock solution?

In 2002, the rare earth elements mine in mountain pass, california was closed because

)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.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %