PLEASE HELP!! 7th grade science !

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa

)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.