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

No. of half life = ^{5.7}/_{1.9 } = 3

1st 2nd 3rd1.25 2.5 5.0 10.0 =10.0g

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