Question

What is the percent of SO2 in H2SO4? Help Please

Answer 1

The percent of SO₂ in H₂SO₄ : 65.3%

Further explanation

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

%Mass A in AxBy =  

$\tt \dfrac{x.Ar~A}{MW~A_xB_y}\times 100\%$  

For SO₂ in H₂SO₄ :

MW SO₂ = 32 + 2.16=64 g/mol

MW H₂SO₄ =2.1+32+4.16=98 g/mol

The percent of SO₂ :

$\tt \dfrac{64}{98}\times 100\%=65.3\%$