Calculate the mass
fraction of all elements in
sodium sulfate (Na2S04).ASAP

Mass fraction of Na = 0.3239

Mass fraction of S = 0.2254

Mass fraction of O = 0.4507

Explanation:

We are given the element as (Na2S04).

Atomic mass of Na = 23

Atomic mass of S = 32

Atomic mass of O = 16

Thus;

Molar mass of (Na2S04) = (23 × 2) + 32 + (16 × 4) = 142

Mass fraction of Na = (23 × 2)/142 = 0.3239

Mass fraction of S = 32/142 = 0.2254

Mass fraction of O = (16 × 4)/142 = 0.4507

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.