What must happen to uranium before it can be used as a fuel source?
A. Stable U-235 must be enriched with 3% radioactive U-238.
B. Stable U-238 must be enriched with 3% radioactive U-235.
C. No changes are necessary.
D. Unstable U-235 must be enriched with 5% U-238 to stabilize it.

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.

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there is none because earth is stationary and flat.