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  4. The half - life of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is

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Q. The half - life of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is

AIEEEAIEEE 2004Chemical Kinetics

Solution:

$2^{6} = \frac{200}{a-x}$
$\left(a - x\right) = 3.125 \,gm$