The following results are the obtained in an experiment to determine the formula of an oxide of Silicon? Mass of crucible = 15.20g Mass of crucible + silicon=15.48g Mass of cruicible + oxide of silicon = 15.80g Find the empirical formula of oxide of Silicon.

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.