I only need help with the top one but if you want you can also do the bottom I don’t really understand the top one so I’m hoping someone else can

No using me for free points

Favoriting the right answer or whatever you do

yes it is balanced

yes

explanation:

search chemistry final b exam in google and a site called quizlet will pop up

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.