Which statement is true about radioactive isotopes? A. They have very unstable nuclei.
B. They have the most stable nuclei.
C. They have emitted all of their neutrons.
D. They have more electrons than protons.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

)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.