2.76g silver carbonate on being strongly heated yields a residue weighing ____?

$\begin{array}{l}{\mathrm{Ag}}_2{\mathrm{CO}}_3\to 2\mathrm{Ag}\left(s\right)+{\mathrm{CO}}_2\left(g\right)+\frac{1}{2}{\mathrm{O}}_2\left(\mathrm{g}\right)\\ 276\mathrm{g} \mathrm{Silver} \mathrm{carbonate}\to 2\times 108g Silver ; by mole-mole analysis\\ =216g\\ 2.76 Silver carbonate\to \frac{216}{276}\times 2.76=2.16g Silver\\ \end{array}$