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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. Fe₃Cl₃is 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)

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