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Iodine-131, a radioactive substance that is effective in locating brain​ tumors, has a​ half-life of only eight days. a hospital purchased 22 grams of the substance but had to wait seven days before it could be used. how much of the substance was left after seven ​days?

Respuesta :

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5 days/8 days = 0.625 half lives 

fraction left after 0.625 half lives = (1/2)^0.625 

= 0.6484197773 

Amount left = 20*0.6484197773 gms 

= 12.97 gms to dp <<<

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