Question

A divalent metal oxide contains 60 % of metal. What is atomic weight of metal ?​

Answer 1

Atomic weight of metal : 24

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

Divalent metal oxide=XO

MW O = 16

MW XO₂ = X+16

`\tt \%mass=(Ar~X)/(X+16)* 100\%\\\\0.6=(X)/(X+16)\\\\0.6(X+16)=X\\\\0.6X+9.6=X\\\\0.4X=9.6\rightarrow X=24`