# Question 713ac

Feb 24, 2017

Clearly, (612-343)*g=??g# $C {O}_{2}$ were evolved..............

#### Explanation:

We don't even need to write this, but the balanced equation is:

$C a C {O}_{3} \left(s\right) + \Delta \rightarrow C a O \left(s\right) + C {O}_{2} \left(g\right) \uparrow$

Is this balanced with respect to mass and charge? You started with $612 \cdot g$ calcium carbonate. You finished with $343 \cdot g$ calcium oxide. Since mass is balanced in all chemical equation, the difference MUST represent the mass of carbon dioxide evolved in the rxn. So how many grams? How many moles of carbon dioxide?

What does the $\Delta$ symbol represent in the reaction?