Question

Iodine-131 has a half-life of 8.10 days. In how many days will 50 grams of Iodine-131 decay to one-eighth of its original amount?

Answer 1

Answer:

24.3 days

Explanation:

What we have to do is discover 1/8 of 50  

we can simply divide 50 by 8 to get an answer of 6.25  

so now we need to discover how long it will take till there are 6.25 g of I2 left  

each 8.1 days its mass is part into equal parts  

so begin part it fifty-fifty and each time you do, you include 8.1 days  

50/2 =25     8.1  

25/2 =12.5      +  8.1  

12.5/2= 6.25      +8.1  

presently you have achieved 1/8 of the first measure of I-131  

so to discover to what extent it took simply include 8.1+8.1+8.1  

(this is equivalent to 8.1x3)  

which rises to 24.3  

it will take 24.3 days for I-131 to decay to 1/8  of its unique mass.