30 which radioisotopes have the same decay mode
and have half-lives greater than 1 hour?
(1) au-198 and n-16 (3) i-131 and p-32
(2) ca-37 and fe-53 (4) tc-99 and u-233

ljjjljlj kjlk,ljym jlyu; jm; l mumytj

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.

there are two significant figures.

4d^55s^1 ( third choice)