Question

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?

Answer 1

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

Explanation:

`77.8*g-18.0*g` oxygen gas reacted, and `22.8*g` carbon was consumed. Given complete combustion, CLEARLY, `(59.8+22.8)*g=82.6*g` `CO_2(g)` were produced.

Why `"CLEARLY?"`. Because mass is conserved in all chemical reactions. `"Garbage in must equal garbage out".` See [this link.](https://socratic.org/questions/can-you-explain-balancing-chemical-equations-in-detail#365584)