What is the percentage error for a mass measurements of 17.7 g? given that the correct value is 21.2g

-16.5 is the percent error because you subtract the theoretical yield from the actual and the difide it by the actual and multiply by 100

for points guys

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.