1. Element A has two naturally occurring isotopes forms that has the masses 108.905 amu and 106.905 amu. What will be the average atomic mass of element A if percentage abundance of these two isotopes are 48.17 % and 51.83 % respectively. ?
2. Fe3Cl3 is mixed to remove excess phosphate from the effluent At a waste water treatment plant. the given reaction is FeCl3 -> Fe3+ + 3Cl- ;Fe3+ + PO43- -> Fe PO4; for this process Determine what concentration of Fe3+ is required to maintain the concentration of phosphate below the limit of 1 mg P/L? Given that the equilibrium constant for the second reaction = 10^26.4. Ksp = 10^-26.4 (for the reverse reaction)