If 400 gm radioactive Iodine is taken initially. Then calculate the amount of 53 I 128 t 1 2 = 25 min left after 75 minutes

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If 400 gm radioactive Iodine is taken initially. Then calculate the amount of

_{53} I^{128} (t_{\frac{1}{2}} = 25 min)

left after 75 minutes

ChemistryChemical KineticsJEE Main

Solution:

2012 Upvotes Verified Answer

The correct answer is: 50

\frac{N}{N_{0}} = {(\frac{1}{2})}^{\frac{T}{t_{\frac{1}{2}}}} \frac{N}{N_{0}} = {(\frac{1}{2})}^{\frac{75}{25}}

N_{0} = 400 g

N = 400/8

N = 50 gm

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