# Upon heating, calcium carbonate decomposes to produce calcium oxide and carbon dioxide. What is the percent yield of CO_2 if 97.5 g CO_2 is collected?

Mar 24, 2016

$C a C {O}_{3} \left(s\right) + \Delta \rightarrow C a O \left(s\right) + C {O}_{2} \left(g\right) \uparrow$
$\frac{97.5 \cdot g}{44.01 \cdot g \cdot m o {l}^{-} 1 \text{ carbon dioxide}}$ $\cong$ $2$ $m o l$.
But we don't know with how much calcium carbonate you started. You started with over $2$ $m o l$ because you collected over $2$ $m o l$ carbon dioxide, and the stoichiometry shows that the moles of calcium carbonate to carbon dioxide were $1 : 1$.