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The half-life of  is 1.9 years. If after 5.7 years the mass of  was found to be 1.25 g. Determine the initial mass of the radioactive isotope

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No. of half life = 5.7/1.9  = 3

             1st                    2nd                   3rd
1.25 arrow 2.5 arrow 5.0 arrow 10.0
           =10.0g

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