Which conclusion was a direct result of the gold foil experiment?
(1) an atom is mostly empty space with a dense, positively charged nucleus.
(2) an atom is composed of at least three types of subatomic particles.
(3) an electron has a positive charge and is located inside the nucleus.
(4) an electron has properties of both waves and particles.

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.

the answer is symmetrical : )