Respuesta :

azamunoz
no.of moles of SF6 = 0.35/molar mass of SF6 = 0.35/146.06 = 2.396 X 10^-3  

so you need 2.396 X 10^-3 moles of NH3 molecules 

molar mass of NH3 = 17.031 g/mole 

that means 1 mole of NH3 = 17.031 g 

so 2.396 X 10^-3 moles of NH3 = 17.031 X 2.396 X 10^-3 = 0.041 g

Answer:

a) [tex]NH_{3}[/tex] = 17 g/mol

b) [tex]SF_{6}[/tex] = 146 g/mol

Explanation:

The molecular weight of a compound is equal to the sum of the atomic weights of the constituent elements.

a) [tex]NH_{3}[/tex]

Atomic weight of N = 14 g/mol

Atomic weight of H = 1 g/mol

Molecular weight = [tex]14\ g/mol + 3(1\ g/mol) = 14 + 3 = 17\ g/mol[/tex]

b) [tex]SF_{6}[/tex]

Atomic weight of S = 32 g/mol

Atomic weight of F = 19 g/mol

Molecular weight = [tex]32\ g/mol + 6(19\ g/mol) = 32 + 114 = 146\ g/mol[/tex]