Question

what is the missing coefficient to make a balanced equation? o₂ + ?c → co

Explanation:

Step1: Count oxygen atoms on left - hand side

There are 2 oxygen atoms in $O_2$.

Step2: Balance oxygen atoms on right - hand side

In $CO$, for 2 oxygen atoms, we need 2 moles of $CO$. So the equation becomes $O_2 + 2C
ightarrow2CO$. The missing coefficient for $C$ is 2.

Answer:

2