Respuesta :
Ans: formula mass = 142.05 amu
Formula mass is the sum of the atomic masses of all the elements that comprise the molecule
Given molecule = Na2SO4
Atomic mass of Na = 22.989 amu
S = 32.065 amu
O = 15.999 amu
Formula mass = 2(Na) + S + 4(O)
= 2(22.989) + 32.065 + 4(15.999) = 142.039 amu
Answer: 142.05 amu
Explanation:-
Formula mass is the amount of a compound with the same mass in grams as the formula mass in amu. It is calculated by adding the atomic masses of all the atoms contained in the formula.
Mass of Na = 22.98 amu
Mass of S = 32.06 amu
Mass of O = 15.99 amu
Thus formula mass of [tex]Na_2SO_4[/tex]= 2(22.99)+32.065+4(15.999)= 142.05amu
