Question

What is the percentage composition of Na,S and O in sodium thiosulphate.

Answer 1

Answer:

Element Symbol Mass Percent

Sodium Na 29.081%

Oxygen O 30.358%

Sulfur S 40.561%

Explanation:

Answer 2

Answer:

Na2S2O3

Molar mass of Na2S2O3 = 23×2 + 32×2 + 16×3 = 46 + 64 + 48

Molar mass of Na2S2O3 = 158g/mol

Mass contributed by Na2 = 23×2= 46

Mass contributed by S2 = 32×2=64

Mass contributed by O3 = 16×3=48

Now ...

Percentage of Na2 = mass contributed by Na2/ Molar mass of Na2S2O3 ×100

Percentage of Na2 = 46/158×100

Percentage of S2 = 64/158×100

Percentage of O3 = 48/158×100