# In a combustion reaction, initially there were 77.8*g of oxygen gas, and a 22.8*g mass of carbon; 18.0*g of oxygen remained after the reaction. If the carbon were completely oxidized, what mass of carbon dioxide resulted?

May 24, 2017

Look at the conditions proposed by the reaction........

#### Explanation:

$77.8 \cdot g - 18.0 \cdot g$ oxygen gas reacted, and $22.8 \cdot g$ carbon was consumed. Given complete combustion, CLEARLY, $\left(59.8 + 22.8\right) \cdot g = 82.6 \cdot g$ $C {O}_{2} \left(g\right)$ were produced.

Why $\text{CLEARLY?}$. Because mass is conserved in all chemical reactions. $\text{Garbage in must equal garbage out} .$ See this link.