2.76 g of silver carbonate on being strongly heated, yields a residue, weighing

$\underset{2\times 276\mathrm{gm}}{2{\mathrm{Ag}}_2{\mathrm{CO}}_3}\stackrel{\mathrm{\Delta }}{⟶}\underset{4\mathrm{x}108\mathrm{gm}}{4\mathrm{Ag}}+2{\mathrm{CO}}_2+{\mathrm{O}}_2$
$\because 2\times 276\mathrm{gm}\text{ of }{\mathrm{Ag}}_2{\mathrm{CO}}_3\text{ gives }4\times 108\mathrm{gm}$
$\therefore 1\mathrm{gm}\text{ of }{\mathrm{Ag}}_2{\mathrm{CO}}_3\text{ gives }=\frac{4\times 108}{2\times 276}$
$\therefore 2.76\mathrm{gm}\text{ of }{\mathrm{Ag}}_2{\mathrm{CO}}_3\text{ gives }$
$\frac{4\times 108\times 2.76}{2\times 276}=2.16\mathrm{gm}$