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Q.
$2.76\, g$ of silver carbonate on being strongly heated yields a
residue weighing
IIT JEEIIT JEE 1979Some Basic Concepts of Chemistry
Solution:
$
Ag _{2} CO _{3}( s ) \rightarrow 2 Ag ( s )+ CO _{2}( g )+\frac{1}{2} O _{2}( g )
$
Molecular Weight of $Ag _{2} CO _{3}=276 g$
And, molecular weight of $Ag =2 \times 108=216 g$
$276 g$ of $Ag _{2} CO _{3}$ give $216 g Ag$.
Therefore, $2.76 g$ of $Ag _{2} CO _{3}$ on heating will give $\frac{216}{276} \times 2.76 g =2.16 g Ag$ as residue.