Barium-131 is a radioactive isotope of the element barium used for gastrointestinal tract scans in doctors offices. barium-131 has a half-life of 10 days. if a patient drinks 2 grams of barium-131 how much of the isotope will be left after 10 days?
a) 0.125 grams b) 0.25 grams c) 0.5 grams d) 1 gram

The correct answer is option D.

Explanation:

Amount of dose given to patient =

Half life of Barium-131 =

Amount of barium-131 left after 10 days.

t = 10 days

Hence, correct answer is option D.

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.